refactor the navs to use prefixed classes, because you know, consistency is beast mode

docs/templates/pages/base-css.mustache

@@ -4,7 +4,7 @@
   <h1>{{_i}}Base CSS{{/i}}</h1>
   <p class="lead">{{_i}}On top of the scaffolding, basic HTML elements are styled and enhanced with extensible classes to provide a fresh, consistent look and feel.{{/i}}</p>
   <div class="subnav">
-    <ul class="nav pills">
+    <ul class="nav nav-pills">
       <li><a href="#typography">{{_i}}Typography{{/i}}</a></li>
       <li><a href="#code">{{_i}}Code{{/i}}</a></li>
       <li><a href="#tables">{{_i}}Tables{{/i}}</a></li>