GitHub workflows

- Add workflow to check for Sphinx warnings on PR.
- Add workflow to build and deploy the documentation on GitHub pages

.github/workflows/build_docs.yaml

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+name: Build and deploy documentation
+on:
+  push:
+    branches:
+      - docs
+jobs:
+  build-docs:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ['3.10']
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y pandoc
+          python -m pip install -e .[development]
+      - name: Build docs
+        run: cd doc && make html
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./doc/build/html

.github/workflows/docs_check.yaml

@@ -0,0 +1,31 @@
+name: Check for Sphinx Warnings
+
+on:
+  pull_request:
+    paths:
+      - "doc/**"
+      - "**/*.rst"
+      - ".github/workflows/docs_check.yaml"
+      - "setup.py"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out the repository
+      uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.x'
+
+    - name: Install dependencies
+      run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e .[development]
+
+    - name: Check for Sphinx warnings
+      run: |
+        sphinx-build -M html ./doc/source ./doc/_build --fail-on-warning