ci: add action for auto deploying documentation

Author: monok8i

.github/workflows/auto-deploy-docs.yml

@@ -0,0 +1,31 @@
+name: Deploy Documentation
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy-docs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
+      - name: Install documentation requirements
+        run: pip install -r requirements-doc.txt
+
+      - name: Build documentation
+        run: mkdocs build --strict
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./site