[TASK] Automate documentation and code linting

Author: fsuter

.gitattributes

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+.gitattributes export-ignore
+.travis.yml export-ignore
+Tests/ export-ignore
+Build/ export-ignore
+.ddev/ export-ignore

.github/workflows/documentation.yml

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+name: test documentation
+
+on: [ push, pull_request ]
+
+jobs:
+  tests:
+    name: documentation
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Test if the documentation will render without warnings
+        run: |
+          mkdir -p Documentation-GENERATED-temp \
+          && docker run --rm --pull always -v $(pwd):/project \
+             ghcr.io/typo3-documentation/render-guides:latest --config=Documentation --no-progress --fail-on-log

.gitignore

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+/Documentation-GENERATED-temp/
+/.Build/
+/.cache/
+composer.json.testing
+composer.lock
+/public/