Issue tracker for UI Overhaul and some more features

[Totto16]

This tracks the progress of the UI Overhaul over on #280 and some feature that were discussed there, but are out of the scope of that PR

Progress

• UI Overhaul Overhaul UI #280
• Adjust screenshots in README no PR
• Add support for accent colors (gnome 47>=) no pr

Individual description

UI Overhaul

This is pretty much advances and nearly merge ready
See the linked issue on #280

Adjust screenshots

This has to be done manually, just recreate the screenshots that are already there in the README, they don't have to be identical, but the general feature set that is shown on them should be similar.

Preferably don't use your desktop, use a default gnome background and empty desktop or similar.

Add support for accent colors

Use accent colors from gnome 47>= onwards, we have to make sure to still support gnome 46.

Some examples on how to that are:

• https://gjs.guide/extensions/upgrading/gnome-shell-47.html#accent-color