Add more instance stats APIs (#6125)

* Add GET /api/v1/instance/peers API to reveal known domains

* Add GET /api/v1/instance/activity API

* Make new APIs disableable, exclude private statuses from activity stats

* Fix code style issue

* Fix week timestamps

app/controllers/auth/confirmations_controller.rb

@@ -2,10 +2,4 @@
 
 class Auth::ConfirmationsController < Devise::ConfirmationsController
   layout 'auth'
-
-  def show
-    super do |user|
-      BootstrapTimelineWorker.perform_async(user.account_id) if user.errors.empty?
-    end
-  end
 end