fix favicon issue

Author: afshinm

img/introjs-demo.png

@@ -12,7 +12,7 @@
   <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css">
   <link rel="stylesheet" href="css/custom.css">
   <link rel="stylesheet" href="minified/introjs.min.css">
-  <link rel="shortcut icon" href="/favicon.ico"/>
+  <link rel="shortcut icon" href="favicon.ico"/>
 
   <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
   <script src="minified/intro.min.js"></script>