feat: use nuxt 4 structure

app/components/Footer.vue

@@ -0,0 +1,7 @@
+<template>
+  <div text="xl gray4" m-5 flex="~ gap3" justify-center>
+    <NuxtLink i-carbon-campsite to="/" />
+    <a i-carbon-logo-github href="https://github.com/antfu/vitesse-nuxt3" target="_blank" />
+    <DarkToggle />
+  </div>
+</template>