feat: update Dockerfile and index page \U0001F4DD

frontend/Dockerfile

@@ -1,5 +1,5 @@
 # Specify the base image
-FROM node:18.17.0
+FROM node:alpine
 
 # Set the working directory in the container
 WORKDIR /app

frontend/pages/index.js

@@ -1,10 +1,10 @@
-import React, { useEffect } from 'react';
+import React from 'react';
 import ReactDOM from 'react-dom/client';
 import App from './_app';
 import reportWebVitals from '../src/reportWebVitals';
 
 // Function to render the app only on the client-side
-const renderApp = () => {
+export default function renderApp() {
   const root = ReactDOM.createRoot(document.getElementById('Gradio-Flow'));
   root.render(
     <React.StrictMode>
@@ -18,4 +18,4 @@ if (typeof window !== 'undefined') {
   renderApp();
 }
 
-reportWebVitals();
+reportWebVitals();