feat: Generate and publish an automated documentation of the app

.github/workflows/generate-doc.yml

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+# .github/workflows/documentation.yml
+name: Documentation
+
+on:
+  push:
+    branches:
+      - '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Generate Documentation
+        uses: SwiftDocOrg/swift-doc@master
+        with:
+          inputs: Sources/
+          module-name: OpenFoodFacts
+          output: Documentation/
+      - name: Update Permissions
+        run: 'sudo chown --recursive $USER Documentation'
+      - name: Deploy API documentation to Github Pages
+        uses: JamesIves/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: gh-pages
+          folder: Documentation/

.jazzy.yaml

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+author_url: https://github.com/openfoodfacts/openfoodfacts-ios
+author: Pierre Slamich
+github_url: https://github.com/openfoodfacts/openfoodfacts-ios
+theme: fullwidth

Documentation/index.txt

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+