get rid of nonsense 404.html

correct 404 handling for invalid pages

app/controllers/exceptions_controller.rb

@@ -1,14 +1,9 @@
 class ExceptionsController < ApplicationController
   skip_before_filter :check_xhr
-  layout 'no_js'
 
   def not_found
-    f = Topic.where(deleted_at: nil, archetype: "regular")
-
-    @latest = f.order('views desc').take(10)
-    @recent = f.order('created_at desc').take(10)
-    @slug =  params[:slug].class == String ? params[:slug] : ''
-    @slug.gsub!('-',' ')
-    render status: 404
+    # centralize all rendering of 404 into app controller
+    raise Discourse::NotFound
   end
+
 end