Add a comment to default.nix and shell.nix briefly outlining what flake-compat/default.nix does.
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# The `default.nix` in flake-compat reads `flake.nix` and `flake.lock` from `src` and# returns an attribute set of the shape `{ defaultNix, shellNix }`
# The `default.nix` in flake-compat reads `flake.nix` and `flake.lock` from `src` and
# returns an attribute set of the shape `{ defaultNix, shellNix }`