Update backers April 2018

docs/_includes/components/categories.html

@@ -30,6 +30,10 @@
   {% endfor %}
 </nav>
 
+{% unless page.hide_side_sponsor %}
+  {% include global/side-sponsor.html %}
+{% endunless %}
+
 {% unless page.hide_fortyfour %}
   {% include global/fortyfour.html %}
 {% endunless %}