add page themes for admins

app/queries/admins/page_themes_query.rb

@@ -0,0 +1,17 @@
+class Admins::PageThemesQuery < ApplicationQuery
+  include CustomSortable
+
+  attr_reader :params
+
+  sort_columns :created_at, default_by: :created_at, default_direction: :desc
+
+  def initialize(params)
+    @params = params
+  end
+
+  def call
+    language_frame = params[:language_frame].blank? ? [0..99] : params[:language_frame]
+    page_themes = PageTheme.where(language_frame: language_frame)
+    custom_sort(page_themes, params[:sort_by], params[:sort_direction])
+  end
+end