Currently we're using the nixpkg for running pridefetch, but due to a
version mismatch we are missing the psutil package. This results in
errors when running pridefetch from this flake. Overriding the
buildInputs is a temporary fix before we update this in nixpkgs.
* Update the flake such that it uses nixpkgs' package with an overriden source rather than keeping a copy
* Update flake.nix
* Update the flake lock file, and make supported systems match the package
* remove surplus whitespace