Add apple high res favicon

Author: minddust

_layouts/default.html

@@ -8,6 +8,7 @@
         <meta name="description" content="{{ page.description }}">{% endif %}
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <link rel="shortcut icon" href="/favicon.ico">
+        <link rel="apple-touch-icon-precomposed" href="/res/favicon-152.png">
         <link rel="stylesheet" type="text/css" href="/res/minddust.min.css">
         <script src="/res/common.min.js"></script>
         <link rel="alternate" type="application/rss+xml" title="{{ site.name }}" href="/feed.xml">