add deploy doc site workflow

.github/workflows/deploy-doc-site.yml

@@ -0,0 +1,43 @@
+name: Deploy Doc Site
+
+on:
+  push:
+    branches:
+      - docusaurus-site-from-root
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - uses: actions/checkout@v3
+          
+      - uses: actions/setup-node@v3
+        name: setup npm
+        with:
+          node-version: 16
+          check-latest: true
+          cache: "npm"
+          cache-dependency-path: website/package-lock.json
+
+      - name: Run a multi-line script
+        run: |
+          npm install
+          npm run build
+        working-directory: website
+        
+      # Popular action to deploy to GitHub Pages:
+      # Docs: https://github.com/peaceiris/actions-gh-pages#%EF%B8%8F-docusaurus
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          # Build output to publish to the `gh-pages` branch:
+          publish_dir: ./website/build
+          # The following lines assign commit authorship to the official
+          # GH-Actions bot for deploys to `gh-pages` branch:
+          # https://github.com/actions/checkout/issues/13#issuecomment-724415212
+          # The GH actions bot is used by default if you didn't specify the two fields.
+          # You can swap them out with your own user credentials.
+          #user_name: github-actions[bot]
+          #user_email: 41898282+github-actions[bot]@users.noreply.github.com