tweak url

admin/app/admin/lesson_booking.rb

@@ -17,7 +17,7 @@ ActiveAdmin.register JamRuby::LessonBooking, :as => 'LessonBookings' do
   index do
     column "User Link" do |lesson_booking|
       span do
-        link_to "Web URL", "#{Rails.application.config.external_root_url}/client#/jamclass/lesson-booking/#{lesson_booking.id}"
+        link_to "Lesson Session URL", "#{lesson_booking.next_lesson.admin_url}"
       end
     end
     column "Type" do |lesson_booking|