Dark Mode for dub.

[jordan4ibanez]

I tend to do long programming sessions. I am very used to dark mode in many applications on and off the web.

I feel that dub is simply missing a toggle on the top right to enable/disable a dark mode for the website.

[dejlek]

I am planning to make a PR for this.

[WebFreak001]

for reference, you might want to orient yourself on the dark dub docs design: https://dub.pm/