feat(github): enable manual deployment from Actions tab (#59)

Co-authored-by: DrakeNguyen <drake.ha.nguyen@gmail.com>

Author: drakehanguyen

.github/workflows/deploy-pages.yml

@@ -6,6 +6,7 @@ name: Deploy to GitHub Pages
 on:
   push:
     branches: [main]
+  workflow_dispatch:  # Manual deploy from Actions tab (no push required)
 
 permissions:
   contents: read