docs: Linuxbrew -> Homebrew

[osalbahr]

Homebrew on Linux was formerly referred to as Linuxbrew. The two projects got merged.

[halostatue]

The change here looks fine, but it looks a little weird to have two headings Homebrew. I’ll leave it up to @twpayne to make the decision, but I think that we should do one of two things:

• remove Homebrew from the macOS section
• rename this section from Homebrew to Homebrew on Linux

My personal preference is for the latter, but it’s a weak preference.

[osalbahr]

I lean more towards keeping it as just Homebrew for brevity reasons and being consistent with having two Nix headings. I’m not sure about, say, “Nix on non-NixOS” either.

I’d like to note that I can see my PR comment being a little misleading. To clarify, “Homebrew on Linux” isn’t the name of a separate package manager that works across Linux systems. It is the same package manager, Homebrew, works on both macOS and Linux. Rather, that phrase is just the heading of a technical documentation webpage.

[bradenhilton]

I'm of the opinion that Homebrew should be moved from the macOS section to the cross-platform section.

I'd personally also swap the sections so the cross-platform section comes before the platform-specific section, but I feel that may be more contentious.

[halostatue]

I just looked at the way it shows up on the web page, and this is a special mkdocs format which creates tabs and nested tabs. I think that this is fine as it is for the current structure, because it corrects the project name from Linuxbrew to Homebrew, and it does nothing else.