Add mybookshelf link to nav bar

Author: mstathers

_layouts/default.html

@@ -25,6 +25,7 @@ <h1><a class="header" href=/>Stathers.net</a></h1>
         <ul class="nav_ul">
             <li class="nav"><a class="nav" href="/">Home</a></li>
             <li class="nav"><a class="nav" href="https://github.com/mstathers/" target="_blank">Projects</a></li>
+            <li class="nav"><a class="nav" href="https://mybookshelf.stathers.net" target="_blank">My Bookshelf</a></li>
             <li class="nav"><a class="nav" href="/contact.html">Contact Me</a></li>
         </ul>
     </div>