moved atom feed (it's not rss) to autodiscovery link element [#26402939]

frontend/templates/supporter.html

@@ -60,6 +60,9 @@ function highlightTarget(targetdiv) {
 };
 </script>
 {% endblock %}
+{% block extra_head %}
+<link rel="alternate" type="application/atom+xml" title="feed for books from {{ supporter }}'s ungluing wishlist" href="feed" />
+{% endblock %}
 
 {% comment %}
 To do:
@@ -259,7 +262,7 @@ there's no tab for seeing ALL my books, only the filters! huh.
                         <li class="tabs3"><a href="#">Wishlisted</a></li>
                     </ul>
                     
-                    <span id="rss"><a href="feed" title="RSS feed of {{ supporter }}'s latest wishbooks" ><img src="/static/images/feedicons-standard/feed-icon-14x14.png" alt="RSS feed of {{ supporter }}'s latest wishbooks" /><span>Subscribe</span></a></span>
+                    
                 
                 		{% if not works %}
                 		{% comment %}