docs: document installing the UiPath CLI via Homebrew

[sherifmak]

Summary

The installation documentation should be updated to include installing the UiPath CLI via Homebrew (brew).

A Homebrew tap already exists (UiPath/homebrew-tap), but the install guide does not currently mention it as an option:

• Docs: https://docs.uipath.com/uipath-cli/standalone/latest/user-guide/installing-uipath-cli

Suggested change

Add a Homebrew installation section to the install guide, e.g.:

brew tap uipath/tap
brew install uipath-cli

(Exact formula/tap names to be confirmed against UiPath/homebrew-tap.)

This gives macOS/Linux users a one-line install and upgrade path alongside the existing methods.