change general highlights quantity

Signed-off-by: Matheus Agio Nerone <man13@inf.ufpr.br>

app/controllers/welcome_controller.rb

@@ -11,6 +11,8 @@ class WelcomeController < ApplicationController
       learning_object_repository.find(id)
     end
 
+    @General = @General.take(3)
+
     @Subjects = subject_repository.all
     @Subjects.delete_if{|s| not s.highlights.present?}
     @Subjects = @Subjects.take(8)