Drop useless reference to absent file

Author: Thierry Boileau

themes/restlet-framework/layouts/_partials/head.html

@@ -1,7 +1,6 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <meta http-equiv="x-ua-compatible" content="ie=edge">
-  <link rel="apple-touch-icon" href="apple-touch-icon.png">
   <link rel="shortcut icon" type="image/x-icon" href="/images/favicon.ico">
   <title>{{ if .IsHome }}{{ site.Title }}{{ else }}{{ printf "%s | %s" site.Title .Title }}{{ end }}</title>
   {{- partialCached "head/css.html" . }}