Fix wraparound on external link indicators

src/_includes/post.njk

@@ -22,7 +22,7 @@ eleventyComputed:
         {% endif %}
     </article>
 
-    <section class="stack-sm">
+    <section class="stack-sm" data-section="responses">
         <h2>Responses</h2>
         
         {% if post.comments.like | length %}