Add author biography at the bottom of the post

templates/posts/details.html.tera

@@ -34,6 +34,20 @@
 
     <div class="article-meta">
         <p>{{ "This article is under the {{ license }} license." | _(license=article.post.license) }}</p>
+        <div class="flex">
+            <img src="{{ author.avatar }}" alt="{{ author.name }}" class="avatar medium padded">
+            <div class="grow">
+                <h2><a href="/@/{{ author.fqn }}">{{ author.name }}</a></h2>
+                <p>{{ author.summary | safe }}</h2>
+            </div>
+            <a href="/@/{{ author.fqn }}/follow" class="button">
+                {% if is_following %}
+                    {{ "Unfollow" | _ }}
+                {% else %}
+                    {{ "Follow" | _ }}
+                {% endif %}
+            </a>
+        </div>
 
         {% if account %}
             <div class="actions">