add sphinx

Signed-off-by: Philip May <philip@may.la>

.github/workflows/build_deploy_doc.yml

@@ -0,0 +1,33 @@
+name: Build & Deploy Doc
+on:
+  push:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      with:
+        python-version: 3.7
+
+    - name: Install
+      run: |
+        python -m pip install -U pip
+        pip install --progress-bar off -U .[doc,optional]
+
+    - name: Make
+      run: |
+        cd docs
+        make html
+        cd ..
+
+    - name: Deploy
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./docs/build/html