experimental: change signature render to <aside> tag

app/templates/common/macros.html

@@ -158,7 +158,7 @@
   </div>
   <div class="plank even no-shadow post-content-inner minimal">{{post.content | safe}}
     {%- if render_sig and post.signature_rendered -%}
-    <div class="post-signature">{{post.signature_rendered | safe}}</div>
+    <aside class="post-signature">{{post.signature_rendered | safe}}</aside>
     {%- endif -%}
   </div>
   {%- if show_reactions -%}