Remove deprecated route and controller method

The deprecated route (/deprecated) and associated controller method
(ErrorsController#deprecated) are no longer needed since V1 API
usage has been removed.

Also removed deprecators.

Author: theseanything

app/controllers/errors_controller.rb

@@ -19,10 +19,4 @@ def internal_server_error
   def maintenance
     render "errors/maintenance", formats: :html
   end
-
-  def deprecated
-    form = Form.find params.require(:form_id)
-    page = Page.find params.require(:page_id), params: { form_id: params.require(:form_id) }
-    redirect_to form_page_path(form_id: form.id, form_slug: form.form_slug, page_slug: page.id, mode: :form)
-  end
 end

config/initializers/forms_api_deprecations.rb

@@ -85,6 +85,5 @@
   get "/maintenance" => "errors#maintenance", as: :maintenance_page
   get "/404", to: "errors#not_found", as: :error_404, via: :all
   get "/500", to: "errors#internal_server_error", as: :error_500, via: :all
-  get "/deprecated", to: "errors#deprecated"
   match "*path", to: "errors#not_found", via: :all
 end