Add widget cards to homepage

app/models/widget.rb

@@ -0,0 +1,2 @@
+class Widget
+end

app/models/widget/card.rb

@@ -0,0 +1,15 @@
+class Widget
+  class Card < ActiveRecord::Base
+    include Imageable
+
+    self.table_name = "widget_cards"
+
+    def self.header
+      where(header: true)
+    end
+
+    def self.body
+      where(header: false).order(:created_at)
+    end
+  end
+end