sitemap.xml contains broken links

[orbeckst]

Expected behaviour

https://www.mdanalysis.org/pmda/sitemap.xml links to pages in the docs

Actual behaviour

Links are broken and contain "0.3":

<?xml version='1.0' encoding='utf-8'?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url><loc>https://www.mdanalysis.org/pmda/0.3/api.html</loc></url>
<url><loc>https://www.mdanalysis.org/pmda/0.3/api/contacts.html</loc></url>
<url><loc>https://www.mdanalysis.org/pmda/0.3/api/custom.html</loc></url>
<url><loc>https://www.mdanalysis.org/pmda/0.3/api/density.html</loc></url>
<url><loc>https://www.mdanalysis.org/pmda/0.3/api/hbond_analysis.html</loc></url>
...

even though the actual pages do not contain version numbers, e.g. https://www.mdanalysis.org/pmda/0.3/api.html is broken but https://www.mdanalysis.org/pmda/api.html is correct.

This prevents the site from being indexed, see also MDAnalysis/MDAnalysis.github.io#202