atom: remove summary

WHY does atom not have a subtitle tag anyways

src/feed.njk

@@ -29,7 +29,6 @@ metadata:
   {% set absolutePostUrl %}{{ post.url | url | absoluteUrl(metadata.url) }}{% endset %}
   <entry>
     <title>{{ post.data.title }}</title>
-    {% if post.data.description %}<summary>{{ post.data.description }}</summary>{% endif %}
     {% if post.data.link %}<link href="{{ post.data.link }}"/>{% else %}<link href="{{ absolutePostUrl }}"/>{% endif %}
     <updated>{{ post.date | dateToRfc3339 }}</updated>
     <id>{{ absolutePostUrl }}</id>