README: Updated dead link for nix channel manual (#379247)

* README: Updated dead link for nix channel

The old link from the manual lead to a dead page.

The new link leads to the nix-channel command on the manual.
However it would also be reasonable for it to lead to the wiki[1] entry on nix channels, or on the channels section of the FAQ[2], however the ladder option already leads to the nix-channel command manual entry "for more information".

[1]: https://nixos.wiki/wiki/Nix_channels
[2]: https://nix.dev/concepts/faq#channel-branches

* README: link to stable branch of the manual instead of a specific version
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@ -59,7 +59,7 @@ system, [Hydra](https://hydra.nixos.org/).
Artifacts successfully built with Hydra are published to cache at
https://cache.nixos.org/. When successful build and test criteria are
met, the Nixpkgs expressions are distributed via [Nix
channels](https://nixos.org/manual/nix/stable/package-management/channels.html).
channels](https://nix.dev/manual/nix/stable/command-ref/nix-channel.html).
# Contributing