feat: add GitHub Actions workflow for documentation deployment

Author: ya7010

.github/workflows/deploy-docs.yml

@@ -0,0 +1,37 @@
+name: Deploy Documentation
+
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+        
+    - name: Install uv
+      run: |
+        curl -LsSf https://astral.sh/uv/install.sh | sh
+        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+        
+    - name: Install dependencies
+      run: |
+        uv pip install --system .
+        uv pip install --system ".[docs]"
+        
+    - name: Build documentation
+      run: uv run task docs-build
+      
+    - name: Deploy to GitHub Pages
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./site