added highres prerendered icon for iOS devices

Author: rossengeorgiev

img/apple-touch-icon.png

@@ -6,6 +6,7 @@
         <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"/>
         <meta name="apple-mobile-web-app-capable" content="yes" />
         <meta name="apple-mobile-web-app-status-bar-style" content="black" />
+        <link rel="apple-touch-icon" sizes="144x144" href="img/apple-touch-icon.png" />
         <link rel="stylesheet" href="css/mobile.css"/>
         <link rel="shortcut icon" href="favicon.ico" />
     </head>