name space ./pkgs overlays

[blaggacao]

I think it is a good idea to name-space ./pkgs overlays to avoid name clashes and for clarity throughout the repo-local usage within profiles. The name space prefix can be stripped during export.

As seen in:

• https://github.com/numtide/flake-utils/blob/master/examples/simple-flake/overlay.nix
• Stripping on flake export

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[blaggacao]

namespacing also helps with sharing the overlay attribute, so consumers would do, after pulling in nixflk overlays from other parties:

{
  _ = pkgs.nrdxp.broot;
  _ = pkgs.blaggacao.exa;
}

As a convention, the name spacing should map the github user. This seems sufficiently unique and in cases there are those rare name clashes, where gitea.com/blaggacao is different than github.com/blaggacao, and they clash, we can still figure out how to work arround.

This seems like an important precedent we ought to set.

But they can still do:

nix build github:nrdp/nixflk#broot (not firm on the syntax yet → pseudo exmaple)