<div class="col-md-3">
  <h2>Categories</h2>
  <ul class="list-group">
  <a href="{% url "blog" %}" class="list-group-item list-group-item-action">All Articles</a>
    {% for category in categories %}
      <a href="{{ category.get_absolute_url }}" class="list-group-item list-group-item-action">{{ category.name }}</a>
    {% endfor %}
  </ul>
  <a href="{% url "blog-rss" %}"><i class="fa fa-rss-square"></i> RSS Feed</a>
</div>
