routes: remove legacy /user/index and /artist/index API endpoints.

These endpoints get zero traffic.

app/controllers/legacy_controller.rb

@@ -17,18 +17,10 @@ class LegacyController < ApplicationController
     end
   end
 
-  def users
-    @users = User.limit(100).search(params).paginate(params[:page])
-  end
-
   def tags
     @tags = Tag.limit(100).search(params).paginate(params[:page], :limit => params[:limit])
   end
 
-  def artists
-    @artists = Artist.limit(100).search(search_params).paginate(params[:page])
-  end
-
   def unavailable
     render :plain => "this resource is no longer available", :status => 410
   end