move frontend to upper dir.

src/plugins/vuetify.js

@@ -0,0 +1,19 @@
+/**
+ * plugins/vuetify.js
+ *
+ * Framework documentation: https://vuetifyjs.com`
+ */
+
+// Styles
+import '@mdi/font/css/materialdesignicons.css'
+import 'vuetify/styles'
+
+// Composables
+import { createVuetify } from 'vuetify'
+
+// https://vuetifyjs.com/en/introduction/why-vuetify/#feature-guides
+export default createVuetify({
+  theme: {
+    defaultTheme: 'light',
+  },
+})