fix missing quote

Author: zamronypj

Diff for: _layouts/contentsidebar.html

@@ -5,7 +5,7 @@
     <div class="inner">
         <nav>
             <ul>
-                <li><a href="{{ "/#intro" | absolute_url }}">Intro</a></li>
+                <li><a href="{{ "/#intro" | absolute_url }}" >Intro</a></li>
                 <li><a href="{{ "/#feature" | absolute_url }}">Features</a></li>
                 <li><a href="{{ "/getting-started" | absolute_url }}">Getting Started</a></li>
                 <li><a href="{{ "/documentation" | absolute_url }}">Documentation</a></li>