docs: write CHANGELOG.md by hand instead of with git-cliff

- git-cliff did not work properly with the style of our commit messages, and the CHANGELOG.md it wrote did not fit our style

.github/workflows/generate-changelog.yml

@@ -1,40 +0,0 @@
-name: Generate Changelog
-
-on:
-  push:
-    branches: [ main ]
-    paths-ignore:
-      - .github/workflows/coolify-helper.yml
-      - .github/workflows/coolify-helper-next.yml
-      - .github/workflows/pr-quality.yaml
-  workflow_dispatch:
-
-permissions:
-  contents: write
-
-jobs:
-  changelog:
-    name: Generate changelog
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Generate changelog
-        uses: orhun/git-cliff-action@v4
-        with:
-          config: cliff.toml
-          args: --verbose
-        env:
-          OUTPUT: CHANGELOG.md
-          GITHUB_REPO: ${{ github.repository }}
-
-      - name: Commit
-        run: |
-          git config user.name 'github-actions[bot]'
-          git config user.email 'github-actions[bot]@users.noreply.github.com'
-          git add CHANGELOG.md
-          git commit -m "docs: update changelog"
-          git push https://${{ secrets.GITHUB_TOKEN }}@github.com/${GITHUB_REPOSITORY}.git HEAD:${GITHUB_REF_NAME}