remove active_admin
remove admin_user model
add admin
remove assets of active_admin
fix member path on members show
add button to create admin
put link to create new admin on members show
add admins
Merge branch 'feature/admins' into develop

* feature/admins:
  add admins
  put link to create new admin on members show
  add button to create admin
  fix member path on members show
  remove assets of active_admin
  add admin
  remove admin_user model
  remove active_admin
pass tests