added summary section

opds/templates/catalog.opds.jinja2

@@ -27,10 +27,10 @@
   <entry>
     <title>{{ entry.title }}</title>
     <id>{{ entry.id }}</id>
+     <summary type="text">{{ entry.summary }}</summary>
     {% for author in entry.authors %}
     <author>
       <name>{{ author }}</name>
-      <uri></uri>
     </author>
     {% endfor %}
     {% if entry.updated %} <updated>{{ entry.updated }}</updated> {% endif %}