add doc builder to use gh-pages

.github/workflows/build-docs.yml

@@ -0,0 +1,36 @@
+name: Build Docs
+
+on:
+  push:
+    branches: [ master ]
+
+  workflow_dispatch:
+
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+          cache-dependency-path: setup.py
+
+      - name: Install dependencies
+        run: |
+          python3 -m pip install --upgrade pip
+          python3 -m pip install '.[complete]'
+      
+      - name: Sphinx Build HTML docs
+        working-directory: docs
+        run: make html
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./docs/_build/html