Create flutter project in frontend directory. Serve frontend web build in backend app.

backend/app.py

@@ -1,10 +1,14 @@
-from quart import Quart
+from quart import Quart, send_from_directory
 
-app = Quart(__name__)
+app = Quart(__name__, static_folder='../frontend/build/web')
 
 @app.route('/')
 async def hello():
-    return "Hello, Quart!"
+    return await send_from_directory(app.static_folder, 'index.html')
+
+@app.route('/<path:path>')
+async def serve_static(path):
+    return await send_from_directory(app.static_folder, path)
 
 if __name__ == "__main__":
     app.run(debug=True)