fix contribute link

index.html

@@ -25,7 +25,7 @@
         </button>
         <div class="collapse navbar-collapse me-auto" id="navbarSupportedContent">
           <ul class="navbar-nav ms-auto mb-2 mb-sm-0">
-            <li class="nav-item mx-2 my-0 h5"><a href="/schemas/#/contribute" class="nav-link">Contribute</a></li>
+            <li class="nav-item mx-2 my-0 h5"><a href="/#/contribute" class="nav-link">Contribute</a></li>
             <li class="nav-item mx-2 my-0 h5"><a href="https://github.com/databio/schema.databio.org" class="nav-link">GitHub Repository</a></li>
           </ul>
         </div>