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Document Homebrew install, reorganize README, and check it against th… #222

Job	Run time
advisories (blocks on a vulnerability)	19s
build (windows-2022)	1m 19s
install.ps1 (pwsh)	1m 15s
install.sh (ubuntu-latest)	8s
build (ubuntu-latest)	1m 20s
build (macos-14)	1m 23s
install.ps1 (powershell)	52s
install.sh (macos-14)	14s
	6m 50s