[Enhancement] Add POP!_OS Button Theme

[yuritoledo]

Hello!

Guys, could you add the POP!_OS theme? Here a thumbnail:

Thanks!

[mrprobot]

I have a fork of Pop OS theme in my repo before they removed the Unity assets. Maybe you can use something of that.

https://github.com/mrprobot/gtk-theme

[mrprobot]

How do I properly add new themes? I have the files for Pop Dark, Pop Light and Vimix in my fork of Unite and I think I understand how to add them to the settings.ui. What I don't get is how it actually sets the right theme then. Is there another file I have to add them?

[jonian]

@mrprobot You also have to add them to https://github.com/hardpixel/unite-shell/blob/master/unite%40hardpixel.eu/schemas/org.gnome.shell.extensions.unite.gschema.xml and then run glib-compile-schemas /path/to/schemas/folder and restart gnome-shell.

[mrprobot]

Pull request submitted

#48