updated github link name

Author: juelg

index.html

@@ -130,7 +130,7 @@ <h1 class="title">
                     <span class="icon">
                       <i class="fab fa-github"></i>
                     </span>
-                    <span>TBA</span>
+                    <span>Code</span>
                   </a>
                 </span>
                 <!-- Doc link -->