Move project logos onto HTTPS

Author: csswizardry

_includes/sub-content.html

@@ -15,9 +15,9 @@
 <h4>Projects</h4>
 
 <ul class="[ list-ui  list-ui--small ]  mb">
-  <li><a href="https://github.com/inuitcss/inuitcss"><img src="http://csswizardry.a.cdnify.io/img/content/logo-inuitcss.png" alt="inuitcss" /></a></li>
+  <li><a href="https://github.com/inuitcss/inuitcss"><img src="{{ site.cdn }}/img/content/logo-inuitcss.png" alt="inuitcss" /></a></li>
   <li><a href="http://itcss.io/">ITCSS</a> – coming soon…</li>
-  <li><a href="http://cssguidelin.es/"><img src="http://csswizardry.a.cdnify.io/img/content/logo-css-guidelines.png" alt="CSS Guidelines" /></a></li>
+  <li><a href="http://cssguidelin.es/"><img src="{{ site.cdn }}/img/content/logo-css-guidelines.png" alt="CSS Guidelines" /></a></li>
 </ul>
 
 <h4>Events</h4>