move html papers to md

feed-short.xml

@@ -18,7 +18,7 @@
       {% else %}
         <item>
           <title>{{ post.title | xml_escape }}</title>
-          <description>{{ post.description | xml_escape }}</description>
+          <description>{{ post.excerpt | xml_escape }}</description>
           <pubDate>{{ post.date | date: "%a, %d %b %Y %H:%M:%S %z" }}</pubDate>
           <link>{{ site.url }}{{ post.url }}</link>
           <guid isPermaLink="true">{{ site.url }}{{ post.url }}</guid>