✨ Story 3.2: router php urls

pages/404.php

@@ -0,0 +1,23 @@
+<?php
+http_response_code(404);
+
+$pageTitle = 'Page non trouvée';
+$currentPage = '';
+
+include_template('header', compact('pageTitle'));
+include_template('navbar', compact('currentPage'));
+?>
+
+<main class="min-h-screen flex items-center justify-center">
+    <div class="container-content text-center py-20">
+        <h1 class="text-display text-primary mb-4">404</h1>
+        <p class="text-xl text-text-secondary mb-8">
+            Oups ! Cette page n'existe pas.
+        </p>
+        <a href="/" class="btn-primary">
+            Retour à l'accueil
+        </a>
+    </div>
+</main>
+
+<?php include_template('footer'); ?>