Add Github ribbon

source/layouts/layout.erb

@@ -154,6 +154,8 @@
                 text-shadow: none !important;
             }
         </style>
+        <a href="https://github.com/paracycle/slackthemes"><img style="position: absolute; z-index: 1000; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/38ef81f8aca64bb9a64448d0d70f1308ef5341ab/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f6461726b626c75655f3132313632312e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png"></a>
+
         <div id="client-ui" class="container-fluid sidebar_theme_hoth_theme">
             <div id="header" class="">
                 <div id="channel_header">