[css-2026] Update outdated information regarding test suite development

Author: svgeesus

css-2026/Overview.bs

@@ -916,12 +916,10 @@ Preserving the Openness of CSS</h5>
 	submitted to W3C are subject to review and correction by the CSS
 	Working Group.
 
-	Further information on submitting testcases and implementation reports
-	can be found from on the CSS Working Group's website at
-	<a href="http://www.w3.org/Style/CSS/Test/">http://www.w3.org/Style/CSS/Test/</a>.
-	Questions should be directed to the
-	<a href="http://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a>
-	mailing list.
+	Up to date implementation reports for CSS specifications
+	can be found on <a href="https://wpt.fyi/css">Web Platform Tests</a>,
+	which is <a href="https://github.com/web-platform-tests/wpt">maintained
+	on GitHub</a>.
 
 <h2 id="CR-exceptions">
 Safe to Release pre-CR Exceptions</h2>