Add GitHub Actions workflow for Docusaurus deployment

.github/workflows/deploy.yml

@@ -0,0 +1,37 @@
+name: Deploy Docusaurus Site to GitHub Pages
+
+on:
+  push:
+    branches:
+      - gh-pages  # Change to your default branch if it's not 'main'
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      # Step 1: Check out the repository
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      # Step 2: Set up Node.js
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18  # Change to the version you use for your project
+
+      # Step 3: Install dependencies
+      - name: Install dependencies
+        run: npm ci  # Faster than 'npm install' because it uses the package-lock.json
+
+      # Step 4: Build the Docusaurus site
+      - name: Build Docusaurus site
+        run: npm run build
+
+      # Step 5: Deploy to GitHub Pages
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./build  # This is the default output directory of Docusaurus
+          cname: acslstack.com # Add your custom domain here