Expand installation instructions; add Nixpkgs option

[waldyrious]

Restish has been added to the Nixpkgs directory with https://github.com/NixOS/nixpkgs/pull/243465 (Thanks @fabaff!) , so now there's an additional method to install it.

This PR expands the installation instructions and includes a mention of Nixpkgs as another way to install Restish.

By the way, we might want to link to Repology for even more installation methods (e.g. there's AUR for ArchLinuz, MacPorts for macOS, pkgsrc for netbsd, Scoop for Windows, and even Termux for Android.

[codecov[bot]]

Codecov Report

Merging #204 (a8522e5) into main (3a541b4) will not change coverage. The diff coverage is n/a.

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[waldyrious]

@danielgtaylor I see you're using a tool called GoReleaser for auto-updating the Homebrew tap. I checked the docs and they seem to also support Nix packages, albeit the instructions seem to be focusing on a custom Nix user repository (NUR). I'm not sure if it still works with the global nixpkgs repository, but I thought I'd mention it :)

[waldyrious]

Also, why don't you submit the Homebrew recipe to the core repository? Any reason you prefer to have a custom tap, or was it just more convenient?

[danielgtaylor]

Also, why don't you submit the Homebrew recipe to the core repository? Any reason you prefer to have a custom tap, or was it just more convenient?

@waldyrious no reason, this was just easy to get started with. I've never submitted anything to the core repo before so it's really just unfamiliarity with the process and how updates get handled there. Feel free to get the ball rolling on that and I can provide support.

[waldyrious]

Feel free to get the ball rolling on that and I can provide support.

Great! I will do that as soon as I get some free time on my hands :)