Merge pull request #21 from machine-learning-apps/enable-docs

fix sidebar

_includes/sidebar.html

@@ -20,7 +20,7 @@
             <a class="aside_nav_link {% if page.title == child.title %} active{% endif %}" href="{{child.url}}">{{child.title}}</a>
 
             {%- if child.has_children -%}
-             <span class="toggle_sub rot180"> &#94;</span>
+             <span class="toggle_sub rot90">▸</span>
             {%- assign father_name = child.title -%}
             {%- assign grandfather_name = item.title -%}
             {% assign grandsons = site.docs | where: "parent", father_name | where: "grand_parent", grandfather_name %}