feat: Ajout de React pour le front, début de refonte du front

assets/react/app/App.jsx

@@ -0,0 +1,20 @@
+import React from 'react';
+import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
+import { HomePage } from './presentation/pages/HomePage.jsx';
+import { MangaDetailPage } from './presentation/pages/MangaDetailPage.jsx';
+import { AddMangaPage } from './presentation/pages/AddMangaPage.jsx';
+
+function App() {
+  return (
+    <BrowserRouter>
+      <Routes>
+        <Route path="/" element={<HomePage />} />
+        <Route path="/manga/:slug" element={<MangaDetailPage />} />
+        <Route path="/add" element={<AddMangaPage />} />
+        <Route path="*" element={<Navigate to="/" replace />} />
+      </Routes>
+    </BrowserRouter>
+  );
+}
+
+export default App;