[Refactor] Move CSS styling into its own folder

Author: chrisdedman

frontend/src/App.js

@@ -1,4 +1,4 @@
-import './App.css';
+import './style/App.css';
 
 import React from 'react';
 import { BrowserRouter as Router, Routes, Route } from 'react-router-dom';

frontend/src/index.js

@@ -1,6 +1,6 @@
 import React from 'react';
 import ReactDOM from 'react-dom/client';
-import './index.css';
+import './style/index.css';
 import App from './App';
 import reportWebVitals from './reportWebVitals';