docs: deploy via action

.github/workflows/docs.yml

@@ -0,0 +1,40 @@
+name: Deploy documentation
+on:
+  push:
+    branches: [main]
+
+defaults:
+  run:
+    working-directory: docs
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: "https://caiyunapp.github.io/cyeva"
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version-file: "pyproject.toml"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+        with:
+          enable-cache: true
+
+      - run: make html
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: "./build/html"
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4