Add GitHub link to footer

views/layout.haml

@@ -27,6 +27,8 @@
       #footer
         %a{ :href => 'https://twitter.com/adrianshort'}<
           @adrianshort made this
+        %a{ :href => 'https://github.com/adrianshort/kiosks'}<
+          Source code
         %a{ :href => 'https://www.adrianshort.org/tags/inlinkuk/'}<
           InLink blog posts
         %a{ :href => 'https://morph.io/adrianshort/inlink-scraper'}<