feat: Group Profile Members List Etc

Created by: Tirokk

Pull Request

Group profile members list etc.

Issues

• relates #5318 (closed)
• relates #5059 (closed)

Todo

• member list
• member count
• join / leave:
  • on leave have a modal?
  • error if I am first a member on group profile load and then leave
    • the count does not decrease
  • join group button
  • leave group button
    • create LeaveGroup mutation
• group type
• action radius
• my role
• add Vue 'head' element to group and user profile
• test
  • change mutate to query
    • for groupMembersQuery
• cleanup:
  • view comments in webapp/pages/group/_id/_slug.vue
  • search Wolle