[FLINK-38925][docs] Update Matomo URL to the right domain (apache#4231)

Author: MartijnVisser

docs/layouts/_default/baseof.html

@@ -34,7 +34,7 @@
     _paq.push(['trackPageView']);
     _paq.push(['enableLinkTracking']);
     (function() {
-      var u="//matomo.privacy.apache.org/";
+      var u="//analytics.apache.org/";
       _paq.push(['setTrackerUrl', u+'matomo.php']);
       _paq.push(['setSiteId', '1']);
       var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];