build: replace @vueuse/head with @unhead/vue

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

src/views/Admin/InstancesView.vue

@@ -183,7 +183,7 @@ import {
 import { useMutation, useQuery } from "@vue/apollo-composable";
 import { computed, inject, ref } from "vue";
 import { useRouter } from "vue-router";
-import { useHead } from "@vueuse/head";
+import { useHead } from "@unhead/vue";
 import CloudQuestion from "../../../node_modules/vue-material-design-icons/CloudQuestion.vue";
 import { Notifier } from "@/plugins/notifier";