mention that non-programmers can also contribute by extending / updating the manual

[ronso0]

not mentioned in Get Involed, is it?

[Holzhaus]

"Help keep our manual or Wiki up-to-date."?
Or should we remove the wiki mention because it is not writable for all users?

[ronso0]

Let's mention only the manual. Plus a link to the repo, and maybe a few more words, along the lines of this
https://mixxx.discourse.group/t/white-noise-effect-in-2-4/27891/5?u=ronso

Unfortunately, many new features aren’t documented in the manual, yet.
Luckily, this is one way for non-programmers to contribute to Mixxx. Here is the source code of the manual and some info about the workflow GitHub - mixxxdj/manual: The Mixxx Manual

Anyone who likes to help with but needs help with the toolchain for example is invited to join us on Zulip https://mixxx.zulipchat.com/#narrow/stream/109176-documentation (requires to create an account)

I think the manual is way more important.
And by now I think the wiki should be authored solely by members. Mappings docu has been moved to the manual and from the top of my head I don't know which pages should be edited/created by anyone.