Update index.html

Co-authored-by: Philippe Le Hegaret <plh@w3.org>

index.html

@@ -193,7 +193,7 @@ <h3>Day-to-day use of labels</h3>
 <section id="horizontal-needs-resolution-transitions">
 	<h3>What happens with *-needs-resolution issues at transition?</h3>
 
-	<p>When a Working Group requests a new Maturity level, the transition <strong>will not be approved</strong> if a horizontal group has an open *-needs-resolution issue showing on the <a rel="nofollow" class="external text" href="https://w3c.github.io/horizontal-issue-tracker/index">tracker boards</a>. Note that the tracker monitors the horizontal group's <em>copy</em> of the issue. Before requesting a new Maturity level, the Working Group is advised to review the tracker and contact the horizontal group to close any lingering issues.</p>
+	<p>When a Working Group requests a new Maturity level, the transition <strong>will not be approved</strong> if a horizontal group has an open *-needs-resolution issue showing on the <a rel="nofollow" class="external text" href="https://www.w3.org/PM/horizontal/">tracker boards</a>. Note that the tracker monitors the horizontal group's <em>copy</em> of the issue. Before requesting a new Maturity level, the Working Group is advised to review the tracker and contact the horizontal group to close any lingering issues.</p>
 
 </section>