[PYT-59] Add favicon

Author: brsoff

_includes/head.html

@@ -2,6 +2,7 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <link rel="shortcut icon" type="image/x-icon" href="{{ site.baseurl }}/favicon.ico?">
   <title>PyTorch</title>
   <link href="https://fonts.googleapis.com/css?family=Lato:300,300i,400,400i,700,700i" rel="stylesheet">
   <link rel="stylesheet" href="{{ site.baseurl }}/assets/main.css">