fix(ci): upload GitHub Pages artifact from app/site

Author: Nora

.github/workflows/deploy.yml

@@ -70,7 +70,7 @@ jobs:
         if: github.event_name == 'push'
         uses: actions/upload-pages-artifact@v3
         with:
-          path: ./site
+          path: ./app/site
 
   deploy:
     environment: