add favicon

Author: sproctor

_includes/head.html

@@ -4,6 +4,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   {%- seo -%}
   <link rel="stylesheet" href="{{ "/assets/main.css" | relative_url }}">
+  <link rel="shortcut icon" type="image/png" href="icon.png">
   {%- feed_meta -%}
   {%- if jekyll.environment == 'production' and site.google_analytics -%}
     {%- include google-analytics.html -%}