move html papers to md

feed.xml

@@ -19,7 +19,6 @@
         <item>
           <title>{{ post.title | xml_escape }}</title>
           <description>
-            {{ post.description | xml_escape }}
             {{ post.content | xml_escape}}
           </description>
           <pubDate>{{ post.date | date: "%a, %d %b %Y %H:%M:%S %z" }}</pubDate>