Update SDK to gradio and app_file to app.py for Python backend deployment

README.md

@@ -3,10 +3,10 @@ title: My React App Demo
 emoji: 🐠
 colorFrom: indigo
 colorTo: red
-sdk: static
+sdk: gradio
 pinned: false
 app_build_command: npm run build
-app_file: build/index.html
+app_file: app.py
 short_description: A demonstration of React app deployment on Hugging Face Spac
 ---
 
@@ -79,4 +79,4 @@ This section has moved here: [https://facebook.github.io/create-react-app/docs/d
 
 ### `npm run build` fails to minify
 
-This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)