add `brew autoremove` to setup.sh, and support apple/Intel silicon mac #787

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2 errors and 2 warnings

Canceling since a higher priority waiting request for 'setup machine-refs/pull/159/merge' exists

The operation was canceled.

You have an unnecessary local Cask tap. This can cause problems installing up-to-date casks. Please remove it by running: brew untap homebrew/cask

You have an unnecessary local Core tap! This can cause problems installing up-to-date formulae. Please remove it by running: brew untap homebrew/core