MacOS Nix Setup (an alternative to Homebrew)

MacOS Nix Setup (an alternative to Homebrew).
I recently got a new Macbook, and began setting up the Nix package manager to install my developer toolset. I mainly did this to try and have a working setup without installing Homebrew. Since I ran into a few issues, I wanted to briefly document what I did and why in case others wanted to try the same.
Why Nix? (and why not Homebrew or MacPorts?) The short answer: hype.

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