Update index.html

Author: dachafra

index.html

@@ -357,7 +357,7 @@ <h2 class="title" style="margin-bottom: 30pt;"><span>Challenge</span></h2>
 
 						<p>
 							<div class="about-content" style="font-size: 14pt">
-                    					<p class="text-center">All details regarding the challenge can be found in <a href="https://w3id.org/kg-construct/workshop/challenge.html">this link</a><br><br></p>
+                    					<p class="text-center">All details regarding the challenge can be found in <a href="https://w3id.org/kg-construct/workshop/2023/challenge.html">this link</a><br><br></p>
 
                     					Workflow for submissions:
 							<ol>