Add "signed in as" header to some pages (#4523)

app/controllers/application_controller.rb

@@ -43,6 +43,10 @@ class ApplicationController < ActionController::Base
     forbidden if current_user.account.suspended?
   end
 
+  def after_sign_out_path_for(_resource_or_scope)
+    new_user_session_path
+  end
+
   protected
 
   def forbidden