This PR updates the Homebrew installation instructions for the Preview release, which has been migrated to ```homebrew/cask``` as ```zed@preview``` (see [Commit](https://github.com/Homebrew/homebrew-cask/commit/bad25d79e13ca41b492c976ef70b72117c402d20)). Release Notes: - N/A
This PR updates the README to include Homebrew installation instructions for the preview version and adds a link to the Homebrew homepage. Release Notes: - N/A --------- Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>