Add rails routes for Project tabs

Proposal

We want 2 tabs - Active, Inactive. When changing these tabs the URL should update so if you refresh you stay on the same tab. The URLs should be:

• /admin/projects/active
• /admin/projects/inactive

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 :projects, only: [:index] do
  collection do
    get :active, :inactive, to: 'projects#index'
  end
end