Update default.html

_layouts/default.html

@@ -9,6 +9,15 @@
     <link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}">
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
     <script src="{{ '/assets/js/respond.js' | relative_url }}"></script>
+    <script>
+      (function(d, s, id){
+        var js, fjs = d.getElementsByTagName(s)[0];
+        if (d.getElementById(id)) {return;}
+        js = d.createElement(s); js.id = id;
+        js.src = "https://assets.gfycat.com/gfycat.js";
+        fjs.parentNode.insertBefore(js, fjs);
+      }(document, 'script', 'gfycat-js'));
+    </script>
     <!--[if lt IE 9]>
       <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
     <![endif]-->