Seems sadly outdated. Several of the linked userscripts are superseded (Github Dark is now a site native) or no longer published.
Personally, I still prefer the user style over Github's solution. I find the official black theme has too much contrast (it was probably made for amoled), and the bluish-black variant looks ugly to me. The user style has very good greys, and as a bonus, I've fallen in love with the cross-hatch pattern background it provides.