Move EmailsOnPush highlight CSS inline instead of being in every notification email.

app/helpers/emails_helper.rb

@@ -33,12 +33,8 @@ module EmailsHelper
     end
   end
 
-  def add_email_highlight_css
-    Rugments::Themes::Github.render(scope: '.highlight')
-  end
-
   def color_email_diff(diffcontent)
-    formatter = Rugments::Formatters::HTML.new(cssclass: 'highlight')
+    formatter = Rugments::Formatters::HTML.new(cssclass: "highlight", inline_theme: :github)
     lexer = Rugments::Lexers::Diff.new
     raw formatter.format(lexer.lex(diffcontent))
   end

app/views/layouts/notify.html.haml

@@ -27,8 +27,7 @@
     }
     .file-stats .deleted-file {
       color: #B00;
-    }
-    #{add_email_highlight_css}
+    }}
   %body
     %div.content
       = yield

app/views/notify/repository_push_email.html.haml

@@ -59,7 +59,6 @@
             %strong
               = diff.new_path
         %hr
-        %pre
         = color_email_diff(diff.diff)
         %br