remove 0.14 guides link from header nav

Author: seanmonstar

_includes/header.html

@@ -6,8 +6,7 @@
     </button>
     <div class="collapse navbar-collapse" id="hyperNavbar">
       <ul class="navbar-nav">
-        <li class="nav-item"><a class="nav-link" href="/guides/1">1.0 Guides</a></li>
-        <li class="nav-item"><a class="nav-link" href="/guides/0.14">0.14 Guides</a></li>
+        <li class="nav-item"><a class="nav-link" href="/guides/1">Guides</a></li>
         <li class="nav-item"><a class="nav-link" href="/contrib">Contrib</a></li>
         <li class="nav-item"><a class="nav-link" href="https://github.com/hyperium/hyper">Source</a></li>
       </ul>