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Hi! I think you might need to do some small correction here:
Probably you meant to say nixos/nixpkgs here (the links target seems to be correct):
Layer #3: Nixpkgs
Nixpkgs is a software distribution (a.k.a. “distro”) for Nix. Specifically, all of the packaging logic for Nixpkgs is hosted on GitHub here:
Also, the running text and already visited links have the same style. Due to this instead of this sentence there was a suggestion to make the mention of the manuals links 
Also see comments on HN and lobste.rs.
I don’t think @fricklerhandwerk is the author of the post, FWIW 