Changes

#; Regular:#: Code for "regular" extensions are hosted on Gerrit at the WMF (which is also mirrored to GitHub) with documentation at https://www.mediawiki.org/wiki. #; DCS Custom:#: Code for the DCS extensions is in the [https://github.com/debtcompliance/mediawiki/tree/master/extensions private Debt Compliance GitHub repo]#; Organic Design:#: Organic Design extensions are in the [https://github.com/OrganicDesign/extensions/tree/master/MediaWiki 'MediaWiki' tree of the Organic Design GitHub repo].