Macos subtree fix

[drewc]

Moved homebrew to another repository, added a subtree for it, and made a raw "build gerbil" doc on macos that now works because of the homebrew-style fixes.

There's a .github workflow in the macos/homebrew folder but I'm fairly certain GH will not use it.

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[drewc]

We need to update the REDME and installation guide as well.

Any idea what files I should look in or should I just grep and go from there?

[vyzo]

top level README.md, doc/guide/README.md, and the macos page in the docs off the top of my head.

[vyzo]

Please so not merge withou updating the docs!