🏗️ Migrerer fra Next.js til Vite react

Co-authored-by: Øydis Kind Refsum <oydis.kind.refsum@nav.no>
Co-authored-by: Christian Bulow Skovborg <christian.bulow.skovborg@nav.no>
Co-authored-by: Amalie Mansåker <amalie.erdal.mansaker@nav.no>
Co-authored-by: Sindre Kjelsrud <sindre.kjelsrud@nav.no>

frontend/src/main.tsx

@@ -0,0 +1,10 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App.tsx'
+import './index.css'
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+)