Add "Team" link to header

The subteams page isn't as useful without a way to reach it.  Add it to
the header.  This involves adding another column to the links; it's
starting to get a bit crowded in the heaser, but I don't think it's too
bad.

Author: lambda

_layouts/default.html

@@ -18,7 +18,7 @@
     <header>
 
     <ul class="row menu">
-      <li class="col-xs-12 col-md-4">
+      <li class="col-xs-12 col-md-2">
         <a href="index.html">
           <img class="img-responsive" src="logos/rust-logo-blk.svg" onerror="this.src='logos/rust-logo-256x256-blk.png'" height="128" width="128" alt="Rust logo" />
         </a>
@@ -75,6 +75,13 @@
           </li>
         </ul>
       </li>
+      <li class="col-xs-4 col-md-2"><h2>&nbsp;</h2>
+        <ul>
+          <li>
+            <a href="team.html">Team</a>
+          </li>
+        </ul>
+      </li>
     </ul>
   </header>
       {{ content }}