Add Dark UI

As there are people around which are unable to look at a light UI only because of their eyes. I am such a person, but there are tons of others around with such an issue.

Hopefully you take this into account for future releases. Thanks!

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edit by @luixxiul

If you have a serious eye problem, definitely f.lux is worth trying.
You can grab a copy here: https://justgetflux.com/

also see below: #271 (comment)

Until every variable which defines color of the UI will be moved to theme.js, it will never be available.

[Krutonium]

👍

[bnvk]

This would be great to have 👍 indeed!

[Adejair]

👍

[bbondy]

might be a little early to have it while we're building out the UI elements, but definitely would like to have this later. Ideally an easy way to install the themes in.

[Arandhras]

I like this, too! Please implement it!

[bradleyrichter]

coming to a future near you:

Can't wait to design it. I'm currently using PSD in dark and AI in light because the toolbars are otherwise confusing!

Hopefully this includes future elements too like history background, download/bookmark page background.

[wastedsunsets]

Dark theme would have this browser as my daily driver.

[idprism]

upvote. more likely to use applications that dont hurt my eyes on open.