How people who like this skin can still get something that closely resembles it:
In Firefox and its derivatives, select "View" from the top menu, then go to "Page Style", and select "No Style". This deactivates all style sheets on the page. Alternatively, all style sheets can be unselected in the "Style Editor" tab of the developer tools which can be opened by pressing F12.
Currently the page says "In MediaWiki 1.24 it will come back - no longer as an extension, but as a real skin - with several improvements. See git clone https://gerrit.wikimedia.org/r/mediawiki/skins/Nostalgia", but that link just shows "Not Found". please fix either the link or explain why it's gone? Mutante (talk) 18:15, 20 June 2014 (UTC)
I removed this for now, the skin repository is currently being migrated (see bug 61256). I'm not planning any functionality changes though, just some boring cleanup.
This skin definitely works and is deployed on https://nostalgia.wikipedia.org/. Not sure why the link above doesn't work, but the skin page has up-to-date download instructions and links.
Where the link has just "/r/" it should be "/r/p/". That gives you this: https://gerrit.wikimedia.org/r/p/mediawiki/skins/Nostalgia but only shows open patches. I think better would be https://gerrit.wikimedia.org/r/#/q/project:mediawiki/skins/Nostalgia,n,z which shows all changes.
