Add cosmo.espace-win.org instance

Summary:
This is a private wiki for inidal.

Requirements:

• read or edit requires an account
• add Minerva Neue skin support
• WikiEditor but not the whole Scribunto package

Ref T1605

Co-authored-by: Sébastien Santoro <dereckson@espace-win.org>

Test Plan: Browse https://cosmo.espace-win.org

Reviewers: dereckson

Reviewed By: dereckson

Subscribers: dereckson

Maniphest Tasks: T1605

Differential Revision: https://devcentral.nasqueron.org/D2270