[Wiki] Create custom MediaWiki Skin

[broxen]

Summary

We need to create a custom mediawiki skin. Probably a subskin based upon something still supported, like https://github.com/cmln/chameleon/

I like Chameleon because it leverages Bootstrap 3, which provides many handy helper classes, is widely used, and easy to extend.

This is a nice darker themed skin we might emulate to a small degree
https://starmadepedia.net/wiki/StarMade_Wiki