fixed editor error by adding pagedown css to template
{# CSS compression. #}
{% compress css %}
+ <link rel="stylesheet" type="text/css" href="{% static 'pagedown/demo/browser/demo.css' %}" />
<link href="{% static 'semantic.min.css' %}" rel="stylesheet">
<link href="{% static 'at.who.css' %}" rel="stylesheet">
<link href="{% static 'prism.css' %}" rel="stylesheet">
