Create documentation.yaml

Add customized workflow to create documentation using sphinx.

.github/workflows/documentation.yaml

@@ -0,0 +1,24 @@
+name: Docs
+on: [push, pull_request, workflow_dispatch]
+permissions:
+    contents: write
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v3
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt && pip install -r docs/requirements.txt
+      - name: Sphinx build
+        run: |
+          cd docs/ && make html
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+        with:
+          publish_branch: main
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: docs/build/
+          force_orphan: true