add search for pages
delete activity and page_activity
Merge branch 'feature/menu-104' into staging

Conflicts:
	app/controllers/web/activities/application_controller.rb
	app/controllers/web/activities/page_activities_controller.rb
	app/decorators/activity_decorator.rb
	app/views/web/activities/page_activities/show.html.haml
	app/views/web/shared/_activity_page_activities_list.html.haml
	config/locales/custom.ru.yml
	db/schema.rb