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This is a more sane default since we do not magically (without opt-in) pull in binaries from `~/bin`. That is not really an expected behavior for many users. Users that still want that behavior can now just flip that switch.
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.