Updated mediawiki/extensions
Project: mediawiki/extensions/skins  fe268c20cf1834dccb54aac9a6f401b60f3e6ecd

Remove Nimbus skin - moved to another repo

See https://www.mediawiki.org/wiki/Skin:Nimbus for current details.

Change-Id: I521cbb7688762f6d55963770510d85b9297d8231