Refact/project (#189)

* refactor: cleanup project entry point
* refactor: remove unused
* refactor: folder restructure

client/src/index.jsx

@@ -0,0 +1,16 @@
+import React from 'react';
+import { createRoot } from 'react-dom/client';
+
+import App from './App';
+
+import './index.scss';
+
+const container = document.getElementById('root');
+// create a root
+const root = createRoot(container);
+
+root.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);