remove the less docs

docs/_includes/nav/css.html

@@ -118,15 +118,6 @@
     <li><a href="#responsive-utilities-tests">Test cases</a></li>
   </ul>
 </li>
-<li>
-  <a href="#less">Using Less</a>
-  <ul class="nav">
-    <li><a href="#less-bootstrap">Compiling Bootstrap</a></li>
-    <li><a href="#less-variables">Variables</a></li>
-    <li><a href="#less-mixins-vendor">Vendor mixins</a></li>
-    <li><a href="#less-mixins-utility">Utility mixins</a></li>
-  </ul>
-</li>
 <li>
   <a href="#sass">Using Sass</a>
   <ul class="nav">

docs/css.html

@@ -15,5 +15,4 @@ lead: "Global CSS settings, fundamental HTML elements styled and enhanced with e
 {% include css/images.html %}
 {% include css/helpers.html %}
 {% include css/responsive-utilities.html %}
-{% include css/less.html %}
 {% include css/sass.html %}