Wait what? That existed for the website? Not yet officially but this is a good alternative. I present to you a userstyle for a dark version of the new web with additional tweaks. In order to use it, you need a browser extension called Stylus which changes the look of the pages with CSS userstyles. It is updated as frequent as possible since the new website is still under development which means many changes happen overtime. Until an official dark style is implemented, you can use this userstyle.
Install the userstyle with Stylish here.
It should autoupdate itself, should I add anything; if theres an update and nothing happens it might be due to the host site as its still under development. Feel free to remove and reinstall the style in that case. A link to the changelog is in the description.
To those who wonder why not Stylish and host on userstyles.org, they collect your browsing history and nobody should support them.