It'd be really good if there was an option for Refined GItHub to include a dark mode.
This would be best as a separate Userstyle/Userscript and you can probably find one already
Just because we can find other ones, why wouldn't you add it to here?
If you have people with a desire to use a product, and you have that product, then people use your product. i.e. If you add this, it means that people who don't want to install Stylish can just install this.
It'd be an option in the menu where you just disable it or enable it
Refined GitHub doesn't have to be everything for everyone.
Keeping a dark mode up to date for the whole site is not gonna be easy work and it will quickly become out of date. It's easier to just build it as a separate extension so once the maintainer loses interest, another one pops up.
I've seen this all the time for Facebook and YouTube: No one wants to put that much work for too long.
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https://github.com/StylishThemes/GitHub-Dark