Document build system on wiki

[nomirosa]

atm most of the build system (how it works, how it can be adapted/used, etc.) is in @mechanomi's head. let's get it out of her head and onto the wiki (in a gentle, non-destructive way. lol)

[infoverload]

I can proofread after and see whether I understand it.

[silopolis]

As a (French) translator that's nurturing the project to integrate several projects documentations, that'd surely be helpful!

Discovered your amazing work thanks to the RtD featuring. Thanks a ton for making it Open Source as it could become a milestone in Sphinx evolution…

Kudos
J