Do not link to Mailchimp CSS

Fix #56

templates/base.html

@@ -21,7 +21,6 @@
         {% endblock meta_tags_in_head %}
         <title>{% block title %}{{ SITENAME|striptags }}{% endblock title %}</title>
         {% block head_links %}
-        <link href="http://cdn-images.mailchimp.com/embedcode/slim-081711.css" rel="stylesheet" type="text/css">
         <link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css" rel="stylesheet">
         {% if SOCIAL %}
         <link href="//netdna.bootstrapcdn.com/font-awesome/4.0.1/css/font-awesome.css" rel="stylesheet">