Limit invitees on admin user page, link to invitations for more

app/controllers/admin/users_controller.rb

@@ -24,6 +24,10 @@ class Admin::UsersController < Admin::BaseController
 
   # GET /admin/users/:username
   def show
+    @invitees = @user.invitees
+    @recent_invitees = @user.invitees.order(created_at: :desc).limit(5)
+    @more_invitees = (@invitees - @recent_invitees).count
+
     if Setting.lndhub_admin_enabled?
       @lndhub_user = @user.lndhub_user
     end