Delete duped twitter:image tag

Author: Shrinks99

_includes/head.html

@@ -27,7 +27,6 @@
     {% else %}
       {{ site.description }}
     {% endif %}">
-  <meta name="twitter:image" content="">
   <!-- RSS Feed -->
   <link rel="alternate" type="application/rss+xml" href="{% base %}feed.atom">