Fix issue #14 and bump react to v18

frontend/index.tsx

@@ -1,5 +1,10 @@
-import ReactDOM from 'react-dom'
+import React from 'react'
+import ReactDOM from 'react-dom/client'
 import { App } from './src/App'
 
-const root = document.getElementById('root')
-ReactDOM.render(<App />, root)
+const root = ReactDOM.createRoot(document.getElementById('root')!)
+root.render(
+    <React.StrictMode>
+        <App></App>
+    </React.StrictMode>
+)