Update wording.

_includes/usage.html

@@ -48,7 +48,7 @@
 </ol>
 
 <h3>A basic setup example</h3>
-<p>Sets up the button clicks and runs shuffle</p>
+<p>If you want functional buttons, check out <a href="{{ site.baseurl }}/js/demos/homepage.js">the js file</a>.</p>
 <pre rel="JavaScript"><code class="language-javascript">$(document).ready(function() {
   var $grid = $('#grid'),
       $sizer = $grid.find('.shuffle__sizer');