Link for docs of the preflibtools

Author: Simon-Rey

preflib/index.html

@@ -43,7 +43,7 @@ <h2 class="left-aligned" id="prefib-tools">PrefLib-Tools</h2>
 
             <p>
                 Have a look at the <a href="https://github.com/PrefLib/preflibtools">preflibtools</a> repository,
-                where you can download the code; and check out the <a href="https://www.docs.preflib.org">documentation</a>!
+                where you can download the code; and check out the <a href="https://preflib.github.io/preflibtools/">documentation</a>!
             </p>
 
             <h2 class="left-aligned">Data Usage and Citation Policy</h2>