Remove add_default_home_page method in favor of rails generated build…

…_home_page method in before_create callback.

app/models/spotlight/exhibit.rb

@@ -38,9 +38,9 @@ class Spotlight::Exhibit < ActiveRecord::Base
 
   serialize :facets, Array
 
+  before_create :build_home_page
   after_create :initialize_config
   after_create :initialize_browse
-  after_create :add_default_home_page
   before_save :sanitize_description
 
   validate :title, presence: true
@@ -90,10 +90,6 @@ def initialize_browse
       long_description: "All items in this exhibit"
   end
 
-  def add_default_home_page
-    Spotlight::HomePage.create(exhibit: self).save
-  end
-
   def sanitize_description
     self.description = HTML::FullSanitizer.new.sanitize(description) if description_changed?
   end