Build documentation in CI

.github/workflows/docs.yml

@@ -0,0 +1,29 @@
+name: Documentation
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: ammaraskar/sphinx-action@master
+      with:
+        docs-folder: doc/
+    - name: Upload artifact
+      # Automatically uploads an artifact from the './_site' directory by default
+      uses: actions/upload-pages-artifact@v1
+      with:
+        path: doc/_build/html/
+
+  deploy:
+    if: github.ref == 'refs/heads/master'
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1

doc/requirements.txt

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+sphinx_rtd_theme