refactor: ♻️ rewrite admin CRUD interface for admins (#825)

* docs: 📝 general documentation + add FAQ page

* fix(frontend): 🐛 readd missing upload button to backups.

* feat(backend): ✨ add support for backup sizes to be displayed on frontend

* feat(backend): ✨ add backend for administrator CRUD of users

* add admin support for user

* refactor(frontend): ♻️ rewrite admin CRUD interface for admins

* fix build errors

Co-authored-by: hay-kot <hay-kot@pm.me>

frontend/components/global/AppToolbar.vue

@@ -0,0 +1,25 @@
+<template>
+  <v-toolbar flat>
+    <BaseButton color="null" rounded secondary @click="$router.go(-1)">
+      <template #icon> {{ $globals.icons.arrowLeftBold }}</template>
+      Back
+    </BaseButton>
+    <slot></slot>
+  </v-toolbar>
+</template>
+
+<script lang="ts">
+import { defineComponent } from "@nuxtjs/composition-api";
+
+export default defineComponent({
+  props: {
+    back: {
+      type: Boolean,
+      default: false,
+    },
+  },
+});
+</script>
+
+<style lang="scss" scoped>
+</style>