Links in table of content are broken

[chatlumo]

Hello,

Sorry for my newbie question, I know it's not an issue about this project but when I follow the steps to build the docs in PDF, it's working fine.
But if the table of content is well in the doc, all links in the TOC are broken. By example, for "The Nextcloud Web interface" item, the link is "the-nextcloud-web-interface-4421797072", and it doesn't work. So, how to repair that ?

Thanks, Julien