Update dokuwiki engine

Goal: Update to latest revision: https://www.dokuwiki.org/changes

We spoke about this with @kevinbowen months ago and did some testing, mainly about the The options to embed HTML and PHP have been completely removed for security reasons in release 2023-04-04a, which broke some of our documentation pages (rss feed integration).

@kevinbowen : I think you updated all pages using the rss features, and now we can migrate ?I can't remember where we were at

Note: In the meantime, 2024-02-06a has been released

Note: we are already using 2023-04-04a for a couple of month, forgot to update this issue.

changed the description

Note: we are now running 2023-04-04b patch release.

ping @skunnyk It looks like 2024-02-06b is available. Can we/you get docs & wiki updated?