changed all files to composition API

pages/index.vue

@@ -11,23 +11,19 @@
   
   
 <script setup>
+import { ref } from 'vue';
+
 definePageMeta({
   layout: 'default'
 })
+
+const darkMode = ref(true)
 </script>
 
 <script>
 export default {
   name: "Testpage",
-  components: {
-  },
-  data() {
-    return {
-      darkMode: true,
-    };
-  },
 }
-
 </script>