Use pagination

source/blog.html

@@ -2,13 +2,14 @@
 layout: default
 title: Blog
 body_class: page--blog
+generator: pagination
 use:
   - posts
 ---
 <h1>Blog</h1>
 
 <ul>
-  {% for post in data.posts %}
+  {% for post in page.pagination.items %}
   <li><a href="{{ post.url }}">{{ post.title }}</a></li>
   {% endfor %}
 </ul>