add jupyter favicon

Author: minrk

favicon.ico

@@ -3,7 +3,7 @@
 <title>Jupyter Project</title>
 
 
-<link rel="shortcut icon" type="image/png" href="favicon.png" />
+<link rel="shortcut icon" href="favicon.ico" />
 <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">
 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.js"></script>
 <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>