reorganize all frontend items

frontend/pages/admin/about.vue

@@ -3,13 +3,14 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from '@nuxtjs/composition-api'
+import { defineComponent } from "@nuxtjs/composition-api";
 
 export default defineComponent({
+  layout: "admin",
   setup() {
-    return {}
-  }
-})
+    return {};
+  },
+});
 </script>
 
 <style scoped>