Move away from settings.nix in favor of flake output.

The reason for the move away is that even though now you have to specify the system you're on in the CLI - you no longer have to have a settings.nix which you have to keep updated with what system you're on while trying to keep it away from git and flake's weird interactions with git.

Created by  awesomearvinder  on June 13, 2021
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