diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
deleted file mode 100644
index ba365bfe4f..0000000000
--- a/.github/ISSUE_TEMPLATE.md
+++ /dev/null
@@ -1,7 +0,0 @@
-## Version of OpenTTD
-
-## Expected result
-
-## Actual result
-
-## Steps to reproduce
diff --git a/.github/workflows/preview_build.yml b/.github/workflows/preview_build.yml
deleted file mode 100644
index 68ca5f083f..0000000000
--- a/.github/workflows/preview_build.yml
+++ /dev/null
@@ -1,133 +0,0 @@
-name: Preview build
-
-on:
-  repository_dispatch:
-    types:
-    - Preview*
-
-jobs:
-  preview:
-    name: Build preview
-
-    runs-on: ubuntu-20.04
-    container:
-      # If you change this version, change the number in the cache step too.
-      image: emscripten/emsdk:3.1.28
-
-    steps:
-    - name: Update deployment status to in progress
-      uses: octokit/request-action@v2.x
-      with:
-        route: POST /repos/{owner}/{repo}/deployments/{deployment_id}/statuses
-        mediaType: |
-          previews:
-          - ant-man
-          - flash
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        deployment_id: ${{ github.event.client_payload.deployment_id }}
-        state: in_progress
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - name: Checkout
-      uses: actions/checkout@v3
-      with:
-        ref: ${{ github.event.client_payload.sha }}
-
-    - name: Name branch
-      run: |
-        name=$(echo "${{ github.event.client_payload.folder }}")
-        git checkout -b ${name}
-
-    - name: Setup cache
-      uses: actions/cache@v3
-      with:
-        path: /emsdk/upstream/emscripten/cache
-        key: 3.1.28-${{ runner.os }}
-
-    - name: Patch Emscripten to support LZMA
-      run: |
-        cd /emsdk/upstream/emscripten
-        patch -p1 < ${GITHUB_WORKSPACE}/os/emscripten/emsdk-liblzma.patch
-
-    - name: Build (host tools)
-      run: |
-        mkdir build-host
-        cd build-host
-
-        echo "::group::CMake"
-        cmake .. -DOPTION_TOOLS_ONLY=ON
-        echo "::endgroup::"
-
-        echo "::group::Build"
-        echo "Running on $(nproc) cores"
-        make -j$(nproc) tools
-        echo "::endgroup::"
-
-    - name: Install GCC problem matcher
-      uses: ammaraskar/gcc-problem-matcher@master
-
-    - name: Build
-      run: |
-        mkdir build
-        cd build
-
-        echo "::group::CMake"
-        emcmake cmake .. \
-          -DHOST_BINARY_DIR=../build-host \
-          -DCMAKE_BUILD_TYPE=Release \
-          # EOF
-        echo "::endgroup::"
-
-        echo "::group::Build"
-        echo "Running on $(nproc) cores"
-        emmake make -j$(nproc)
-        echo "::endgroup::"
-
-    - name: Publish preview
-      run: |
-        pip3 install awscli
-
-        aws s3 cp --only-show-errors build/openttd.data s3://${{ secrets.PREVIEW_S3_BUCKET }}/${{ github.event.client_payload.folder }}/
-        aws s3 cp --only-show-errors build/openttd.html s3://${{ secrets.PREVIEW_S3_BUCKET }}/${{ github.event.client_payload.folder }}/
-        aws s3 cp --only-show-errors build/openttd.js s3://${{ secrets.PREVIEW_S3_BUCKET }}/${{ github.event.client_payload.folder }}/
-        aws s3 cp --only-show-errors build/openttd.wasm s3://${{ secrets.PREVIEW_S3_BUCKET }}/${{ github.event.client_payload.folder }}/
-
-        # Invalidate the cache of the CloudFront distribution
-        aws cloudfront create-invalidation --distribution-id ${{ secrets.PREVIEW_CF_DISTRIBUTION_ID }} --paths "/${{ github.event.client_payload.folder }}/*"
-      env:
-        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
-        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
-
-    - name: Update deployment status to success
-      uses: octokit/request-action@v2.x
-      with:
-        route: POST /repos/{owner}/{repo}/deployments/{deployment_id}/statuses
-        mediaType: |
-          previews:
-          - ant-man
-          - flash
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        deployment_id: ${{ github.event.client_payload.deployment_id }}
-        state: success
-        environment_url: https://preview.openttd.org/${{ github.event.client_payload.folder }}/
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - if: failure()
-      name: Update deployment status to failure
-      uses: octokit/request-action@v2.x
-      with:
-        route: POST /repos/{owner}/{repo}/deployments/{deployment_id}/statuses
-        mediaType: |
-          previews:
-          - ant-man
-          - flash
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        deployment_id: ${{ github.event.client_payload.deployment_id }}
-        state: failure
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
diff --git a/.github/workflows/preview_label.yml b/.github/workflows/preview_label.yml
deleted file mode 100644
index 503d4e53eb..0000000000
--- a/.github/workflows/preview_label.yml
+++ /dev/null
@@ -1,66 +0,0 @@
-name: Preview label
-
-on:
-  pull_request_target:
-    types:
-    - labeled
-
-env:
-  TEAM_CORE_DEVELOPER: core-developers
-
-jobs:
-  check_preview_label:
-    name: Check for preview label
-    if: github.event.action == 'labeled' && github.event.label.name == 'preview'
-
-    runs-on: ubuntu-20.04
-
-    steps:
-    - name: Check if label was added by core developer
-      id: core_developer
-      continue-on-error: true
-      uses: octokit/request-action@v2.x
-      with:
-        route: GET /orgs/OpenTTD/teams/${{ env.TEAM_CORE_DEVELOPER }}/memberships/${{ github.event.sender.login }}
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - if: steps.core_developer.outcome == 'failure'
-      name: Remove preview label if not core developer
-      uses: octokit/request-action@v2.x
-      with:
-        route: DELETE /repos/{owner}/{repo}/issues/{issue_number}/labels/preview
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        issue_number: ${{ github.event.number }}
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - if: steps.core_developer.outcome == 'success'
-      name: Create deployment
-      id: deployment
-      uses: octokit/request-action@v2.x
-      with:
-        route: POST /repos/{owner}/{repo}/deployments
-        mediaType: |
-          previews:
-          - ant-man
-          - flash
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        ref: ${{ github.event.pull_request.head.sha }}
-        task: deploy:preview
-        auto_merge: false
-        required_contexts: "[]"
-        environment: preview-pr-${{ github.event.number }}
-        description: "Preview for Pull Request #${{ github.event.number }}"
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - if: steps.core_developer.outcome == 'success'
-      name: Trigger 'preview build'
-      uses: peter-evans/repository-dispatch@v2
-      with:
-        token: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-        event-type: "Preview build #${{ github.event.number }}"
-        client-payload: '{"folder": "pr${{ github.event.number }}", "sha": "${{ github.event.pull_request.head.sha }}", "deployment_id": "${{ fromJson(steps.deployment.outputs.data).id }}"}'
diff --git a/.github/workflows/preview_push.yml b/.github/workflows/preview_push.yml
deleted file mode 100644
index 3868c16f90..0000000000
--- a/.github/workflows/preview_push.yml
+++ /dev/null
@@ -1,66 +0,0 @@
-name: Preview push
-
-on:
-  pull_request_target:
-    types:
-    - synchronize
-
-jobs:
-  check_new_preview:
-    name: Check preview needs update
-
-    runs-on: ubuntu-20.04
-
-    steps:
-    - name: Check if earlier preview exists
-      id: earlier_preview
-      uses: octokit/request-action@v2.x
-      with:
-        route: GET /repos/{owner}/{repo}/deployments
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        environment: preview-pr-${{ github.event.number }}
-        per_page: 1
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - if: toJson(fromJson(steps.earlier_preview.outputs.data)) != '[]'
-      name: Check for preview label
-      id: preview_label
-      uses: octokit/request-action@v2.x
-      with:
-        route: GET /repos/{owner}/{repo}/issues/{issue_number}/labels
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        issue_number: ${{ github.event.number }}
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - if: toJson(fromJson(steps.earlier_preview.outputs.data)) != '[]' && contains(fromJson(steps.preview_label.outputs.data).*.name, 'preview')
-      name: Create deployment
-      id: deployment
-      uses: octokit/request-action@v2.x
-      with:
-        route: POST /repos/{owner}/{repo}/deployments
-        mediaType: |
-          previews:
-          - ant-man
-          - flash
-        owner: ${{ github.event.repository.owner.login }}
-        repo: ${{ github.event.repository.name }}
-        ref: ${{ github.event.pull_request.head.sha }}
-        task: deploy:preview
-        auto_merge: false
-        required_contexts: "[]"
-        environment: preview-pr-${{ github.event.number }}
-        description: "Preview for Pull Request #${{ github.event.number }}"
-      env:
-        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-
-    - if: toJson(fromJson(steps.earlier_preview.outputs.data)) != '[]' && contains(fromJson(steps.preview_label.outputs.data).*.name, 'preview')
-      name: Trigger 'preview build'
-      uses: peter-evans/repository-dispatch@v2
-      with:
-        token: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
-        event-type: "Preview build #${{ github.event.number }}"
-        client-payload: '{"folder": "pr${{ github.event.number }}", "sha": "${{ github.event.pull_request.head.sha }}", "deployment_id": "${{ fromJson(steps.deployment.outputs.data).id }}"}'
diff --git a/.github/workflows/upload-aws.yml b/.github/workflows/upload-aws.yml
deleted file mode 100644
index 72319ad5ab..0000000000
--- a/.github/workflows/upload-aws.yml
+++ /dev/null
@@ -1,76 +0,0 @@
-name: Upload (AWS)
-
-on:
-  workflow_call:
-    inputs:
-      version:
-        required: true
-        type: string
-      folder:
-        required: true
-        type: string
-      trigger_type:
-        required: true
-        type: string
-
-jobs:
-  upload:
-    name: Upload (AWS)
-
-    runs-on: ubuntu-20.04
-
-    steps:
-    - name: Download all bundles
-      uses: actions/download-artifact@v3
-
-    - name: Calculate checksums
-      run: |
-        echo "::group::Move bundles to a single folder"
-        mkdir bundles
-        mv openttd-*/* bundles/
-        echo "::endgroup::"
-
-        cd bundles
-        for i in $(ls openttd-*); do
-          echo "::group::Calculating checksums for ${i}"
-          openssl dgst -r -md5 -hex $i > $i.md5sum
-          openssl dgst -r -sha1 -hex $i > $i.sha1sum
-          openssl dgst -r -sha256 -hex $i > $i.sha256sum
-          echo "::endgroup::"
-        done
-
-        # Some targets generate files that are meant for our-eyes-only.
-        # They are stored in the "internal" folder, and contains bundles
-        # for targets like Windows Store. No user has a benefit of knowing
-        # they exist, hence: internal.
-        if [ -e internal ]; then
-          cd internal
-          for i in $(ls openttd-*); do
-            echo "::group::Calculating checksums for ${i}"
-            openssl dgst -r -md5 -hex $i > $i.md5sum
-            openssl dgst -r -sha1 -hex $i > $i.sha1sum
-            openssl dgst -r -sha256 -hex $i > $i.sha256sum
-            echo "::endgroup::"
-          done
-        fi
-
-    - name: Upload bundles to AWS
-      run: |
-        aws s3 cp --recursive --only-show-errors bundles/ s3://${{ secrets.CDN_S3_BUCKET }}/${{ inputs.folder }}/${{ inputs.version }}/
-
-        # We do not invalidate the CloudFront distribution here. The trigger
-        # for "New OpenTTD release" first updated the manifest files and
-        # creates an index.html. We invalidate after that, so everything
-        # becomes visible at once.
-      env:
-        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
-        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
-        AWS_DEFAULT_REGION: ${{ secrets.AWS_REGION }}
-
-    - name: Trigger 'New OpenTTD release'
-      uses: peter-evans/repository-dispatch@v2
-      with:
-        token: ${{ secrets.DEPLOYMENT_TOKEN }}
-        repository: OpenTTD/workflows
-        event-type: ${{ inputs.trigger_type }}
-        client-payload: '{"version": "${{ inputs.version }}", "folder": "${{ inputs.folder }}"}'