Internal links in the knowledge base articles

[tograss]

Since currently there are efforts to improve the KB I would like to highlight two suggestions from user echo
https://glpi.userecho.com/communities/1/topics/2121-internal-links-in-the-knowledge-base-articles .
-> I'm a bit unsure if this was actually implemented at one point
It seams the anchor plugin was part of glpi once but is missing now.

And https://glpi.userecho.com/communities/1/topics/2152-tinymce-with-table-of-content-plugin-in-knowledge-base adding a toc would improve the kb