Dang said he’d do it at one point and then it was never done. I desperately want it for reading in bed (iOS). Some day…
If that’s too tedious for you: Settings - Control Center - add Accessibility Shortcuts, and follow the instructions to add Smart Invert.
If that’s too tedious for you, go into Settings - Accessibility - Touch - enable Touch Accomodations and set double or triple tap to Smart Invert.
You now have HN dark mode.
Then you can write custom CSS (and JS) to tweak any site, and don't need to beg the webmaster.