ci: add GitHub Actions workflow for automatic deployment

- Automatically deploy to GitHub Pages on master branch push
- Build and deploy process using Node.js 18
- Uses peaceiris/actions-gh-pages for reliable deployment
- Ensures master branch always syncs with gh-pages

Author: davidagustin

.github/workflows/deploy.yml

@@ -0,0 +1,31 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+      
+    - name: Setup Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: '18'
+        cache: 'npm'
+        
+    - name: Install dependencies
+      run: npm ci
+      
+    - name: Build
+      run: npm run build
+      
+    - name: Deploy to GitHub Pages
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./build