update mekanism forks

[maggi373]

No description provided.

[maggi373]

there is also three active forks based on mek:ce, should those be included aswell?

[makamys]

I added a 1.12.2 forks page now, you should move the 1.12.2 fork there (this also means you'll have to re-merge the commit, sorry about that.)

Also, you should run python3 build.py to regenerate the markdown files before comitting if you can. Edit: This is no longer necessary.

should those be included aswell?

Yes, the more forks, the better. The only requirement is they should have code changes and not just build script tweaks.