minimized file size of main logo

Author: DennisOSRM

index.html

@@ -14,7 +14,7 @@
       <li><a class="last" href="https://github.com/DennisOSRM/Project-OSRM/pulls">Pull Requests</a></li>
     </ul>
   </div-->
-<img src="osrm3.png" alt="Logo" >
+<img src="osrm3-nq8.png" alt="Logo" >
 <hr>
 <a href="http://map.project-osrm.org/"><img src="images/demo-screenshot.png" alt="Screen Shot"></a>
 <hr>