Add lefthook-bin to Arch install docs

[ellsclytn]

⚡ Summary

The Arch Linux installation docs currently mention the lefthook AUR package, but do not currently make note of the lefthook-bin package.

Value

This may be preferable by many people who prefer to use precompiled binaries over having to have the application compiled locally.

I know this isn't really a "feature request" in the traditional sense, but that felt like the most suitable issue type. I'd happily open a PR, but I wanted to raise it as an issue first in case there may have been an active preference to only list the one package.

[mrexox]

Wow, I never saw this repo before! Thank you for mentioning! It makes sense to add this to docs.

BWT, currently I'm on a way of replacing these docs with the new one for convenience. But I'll add mentions to both.