Update index.html fix header for Find, use,.... (#2862)

Author: nataled

index.html

@@ -50,7 +50,7 @@ <h4>Participate</h4>
         </ul>
     </div>
 
-    <h4>OBO Library: find, use, and contribute to community ontologies</h4>
+    <h4>Find, use, and contribute to community ontologies</h4>
 </div>
 
 <div class="row">