chore: improve lighthouse

src/App.vue

@@ -1,6 +1,6 @@
 <template>
-  <div class="px-4 py-10 text-center text-gray-700 dark:text-gray-200">
+  <main class="px-4 py-10 text-center text-gray-700 dark:text-gray-200">
     <router-view />
     <Footer />
-  </div>
+  </main>
 </template>