Theme variants!

Theme variant support is now complete, and there are 2 variants provided (dark-a and dark-b) by elmerfdz. They're pretty slick!

You can set which is the initial theme by adding the following to your settings.js:

var themeVariant = 'dark-a';

Otherwise it defaults to the white. You can switch this via a drop-down in the page footer, and the value is saved to localStorage (so it will stick for the given device).

Feel free to make your own and either start an Issue or add it via a Pull Request and I'll add it to the theme!