Sitemap is generated with www.opennms.com instead docs.opennms.com

When we generate the documentation the sitemap.xml files are generated using the URL parameter from the Antora Playbook as URL base reference. It is also used as the home link when you click on the logo which acts as the home button.
This impacts a) google crawlers hitting a 404 and preventing them from indexing our site effectively and b) we can't switch to an indexing service cause they rely on the sitemap for scrapping and indexing the content.