chore(demo): add favicon.ico

Closes #3398

Author: fassetar

misc/demo/assets/favicon.ico

@@ -4,10 +4,10 @@
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
+    <link rel="icon" href="assets/favicon.ico" />
     <title>Angular directives for Bootstrap</title>
     <meta name="description" content="AngularJS (Angular) native directives for Bootstrap. Small footprint (5kB gzipped!), no 3rd party JS dependencies (jQuery, bootstrap JS) required! Widgets: <% demoModules.forEach(function(module) { %><%= module.displayName %>, <% }); %>">
     <meta name="google-site-verification" content="7lc5HyceLDqpV_6oNHteYFfxDJH7-S3DwnJKtNUKcRg" />
-
     <script src="//cdnjs.cloudflare.com/ajax/libs/fastclick/0.6.7/fastclick.min.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.0.0/FileSaver.min.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/jszip/2.4.0/jszip.min.js"></script>