Move system/home/default.nix into system/default.nix,
system/home/desktop/default.nix into system/desktop.nix to reduce
unnecessary duplication. Moved everything in home/desktop up to home/
and adjusted paths accordingly. Moved wallpapers up to system/ since
it makes sense with where it's used.
Merge allowUnfreePredicate into single place again since it seems to
override rather than combine if used multiple times.
Install NoMachine on all machines again by default.
Add separate config files for waybar, fuzzel, mako
Enable gnome-keyring as secret-service, with seahorse for interface
Restructure desktop-related things into a desktop directory
Use password-store where possible to populate secret store without
user interaction (currently only Proton still needs manual input)
Add spotify to secret store ready for spotifyd
Evie Litherland-Smith