fix: v-for explicit key

[setchy]

Description

Addressed Issue

Fixes startup warning

Module Warning (from ./node_modules/vue-loader/lib/loaders/templateLoader.js):
(Emitted value instead of an instance of Error) <router-link v-for="item in section.children">: component lists rendered with v-for should have explicit keys. See https://vuejs.org/guide/list.html#key for more info.

 @ ./src/views/administration/AdminMenu.vue?vue&type=template&id=45a3a857&scoped=true& 1:0-438 1:0-438
 @ ./src/views/administration/AdminMenu.vue
 @ ./node_modules/babel-loader/lib??ref--12-0!./node_modules/cache-loader/dist/cjs.js??ref--0-0!./node_modules/vue-loader/lib??vue-loader-options!./src/views/administration/Administration.vue?vue&type=script&lang=js&
 @ ./src/views/administration/Administration.vue?vue&type=script&lang=js&
 @ ./src/views/administration/Administration.vue
 @ ./src/router/index.js
 @ ./src/main.js
 @ multi (webpack)-dev-server/client?http://192.168.1.108:8080/sockjs-node (webpack)/hot/dev-server.js ./src/main.js

Additional Details

Checklist

• I have read and understand the contributing guidelines
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly