Add favicon meta tags

_includes/head.html

@@ -5,6 +5,10 @@
   <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
   <title>{% if site.title %}{{ site.title }}{% else %}{{ site.app.name }}{% endif %}</title>
   <meta name="description" content="{{ site.description }}">
+  
+  <!-- Favicon -->
+  <link rel="shortcut icon" href="favicon.ico">
+  <link rel="apple-touch-icon-precomposed" href="apple-icon-precomposed.png">
 
   {% if site.enable.smart_app_banner %}
   <!-- Smart App Banner -->