Add more flexibility to config.css

[r1c05h37]

The flexibility at the current release is very inconsistent there, as an example you can change colors, fonts and shadows all you want, but out-of package to change font size you'd have to go to index.css and change it manually
Also I can't find the option to remove the "youtube music" after title anywhere, I will have to tinker with it manually sadly

Otherwise everything is pretty solid, thanks for such a plugin

[Nerixyz]

If you can, check out CurrentSong2, the successor, at https://currentsong.nerixyz.de (https://github.com/Nerixyz/current-song2). It has a lot more theming support. If the provided options aren't enough, you can use a custom script loaded in the overlay. The extension support isn't there yet, however.