distinguish between posts and digests in sidebar

source/_includes/asides/recent_posts.html

@@ -1,10 +1,21 @@
 <section class="apdev--aside-recent">
   <h1>Recent Posts</h1>
   <ul id="recent_posts">
-    {% for post in site.posts limit: site.recent_posts %}
+    {% for post in site.categories.post limit: site.recent_posts %}
       <li class="post">
         <a href="{{ root_url }}{{ post.url }}">{% if site.titlecase %}{{ post.title | titlecase }}{% else %}{{ post.title }}{% endif %}</a>
       </li>
     {% endfor %}
   </ul>
 </section>
+
+<section class="apdev--aside-recent">
+  <h1>Recent Digests</h1>
+  <ul id="recent_digests">
+    {% for post in site.categories.digest limit: 5 %}
+      <li class="post">
+        <a href="{{ root_url }}{{ post.url }}">{{ post.title | replace:'weekly digest','week'}}</a>
+      </li>
+    {% endfor %}
+  </ul>
+</section>