Add rails routes for Group tabs

Proposal

We want 3 tabs - Active, Inactive, and All. When changing these tabs the URL should update so if you refresh you stay on the same tab. The URLs should be:

• /admin/groups/active
• /admin/groups/inactive
• /admin/groups/all

Implementation guide

We can do the changing of URL when changing tabs with frontend routing but we need Rails routes setup so you don't get a 404 when reloading. Add the following to config/routes/admin.rb

resources :groups, only: [:index, :new, :create] do
  collection do
    get :active, :inactive, :all, to: 'groups#index'
  end
end