Update to use "Font Awesome" CDN

Author: mcwarman

css/main.css

@@ -14,4 +14,8 @@ h1 {
   display: inline;
   padding-left: 5px;
   padding-right: 5px;
+}
+
+#navigation ul li a {
+  color: #000;
 }

images/GitHub-Mark-120px-plus.png

@@ -24,11 +24,12 @@ <h1>Matthew Warman</h1>
       <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
       <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
       <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
+      <script src="https://use.fontawesome.com/86424f27f1.js"></script>
       <div class="separator" />
       <div id="navigation">
         <ul>
           <li>
-            <a href="https://github.com/mcwarman"><img src="images/GitHub-Mark-120px-plus.png" alt="github" width="32" /></a>
+            <a href="https://github.com/mcwarman" aria-label="Link to GitHub profile"><i class="fa fa-github fa-3x" aria-hidden="true"></i></a>
           </li>
         </ul>
       </div>