I added back Dark Mode. It's not perfect, there are a number of new things that have been added that I need to now style, but it's dark and I hope that's enough. Apologies for blinding you all with the default (light) theme - Dark Mode had some serious issues initially which I have fixed.
Feel free to let me know in here as before any issues you come across and I'll see that they're resolved.
As a refresher, you can change to Dark Mode in the Footer of the site, at the bottom of every page: