update docs nav to use new stuff

_includes/nav-main.html

 <div class="navbar navbar-inverse navbar-fixed-top bs-docs-nav">
   <div class="container">
-    <a href="{{ page.base_url }}" class="navbar-brand">Bootstrap 3 RC1</a>
     <button class="navbar-toggle" type="button" data-toggle="collapse" data-target=".bs-navbar-collapse">
       <span class="icon-bar"></span>
       <span class="icon-bar"></span>
       <span class="icon-bar"></span>
     </button>
+    <a href="{{ page.base_url }}" class="navbar-brand">Bootstrap 3 RC1</a>
     <div class="nav-collapse collapse bs-navbar-collapse">
       <ul class="nav navbar-nav">
         <li{% if page.slug == "getting-started" %} class="active"{% endif %}>