References to the "wikis" (which no longer exist)

[Wuzzy2]

This webpage: https://www.luanti.org/en/get-involved/

refers to "wikis" in two places, but the wikis no longer exist.

Quotes:

For more information, see the glossary or engine overview developer wiki pages.

You can tip money to celeron55. He is the original creator of Luanti, and hosts the forums and wikis.

Also, two references to a wiki are made on the Edu page at https://www.luanti.org/en/education/:

Luanti Wiki (Edu page)

Create/host a server (Wiki)

Please update the texts. For example, by renaming "wiki" to "documentation".

[dogedede]

I'd like to work on this issue, will PR soon.