Removes unused file and style

app/assets/stylesheets/admin.scss

@@ -106,7 +106,6 @@ body.admin {
 
   a {
     color: white\9 !important;
-    color: red\9 !important;
   }
 
   ul {

app/models/abilities/banner.rb

@@ -1,20 +0,0 @@
-class Banner < ActiveRecord::Base
-
-  acts_as_paranoid column: :hidden_at
-  include ActsAsParanoidAliases
-
-  validates :title, presence: true,
-                    length: { minimum: 2 }
-  validates :description,  presence: true
-  validates :target_url, presence: true
-  validates :style, presence: true
-  validates :image, presence: true
-  validates :post_started_at, presence: true
-  validates :post_ended_at, presence: true
-
-  scope :with_active,  -> {where("post_started_at <= ?", Time.now).
-                      where("post_ended_at >= ?", Time.now) }
-
-  scope :with_inactive,-> {where("post_started_at > ? or post_ended_at < ?", Time.now, Time.now) }
-
-end