Guix for NixOS

What differs this fork from Emiller's and BQV's?

• I'm going to keep this (mostly) updated with guix's master branch

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Notes:

• This is a Nix Flake
• This is a WIP based off of Emiller88's and BQV's initial work

TODO:

• Fixup various things
• Make a default.nix compatible with non-flake nix