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.
Move steam config to separate file, import by Vanguard.
Move work config up one level (system rather than home) to config
allowUnfreePredicate for NoMachine.
Install teams and twinkle on desktop by default.
Fetch pinned version of nixpkgs-unstable to get newer papermcServer
versions
Remove bedrock.xenia.me.uk since it doesn't actually handle the port
redirection anyway...
Place home-manager config under home directory, move system config
under system directory.
Add hostname-specific entries under home directory to be consistent
with how system is configured, update flake accordingly
