Remove typekit

Url is 404. IIRC this was for custom fonts; I'm not sure we still use
them.

Author: Carreau

_includes/head.html

@@ -34,8 +34,6 @@
         <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
         <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
     <![endif]-->
-    <script src="//use.typekit.net/kpd5yrh.js"></script>
-    <script>try{Typekit.load();}catch(e){}</script>
     <script>
       (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
       (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),