Update README.md for improved installation and usage instructions

[damiant]

This pull request updates the README.md to provide clearer installation instructions and more comprehensive documentation for using the Builder.io Dev-tools with Homebrew. The changes focus on improving usability for new users and clarifying the available commands and installation methods.

Documentation and usability improvements:

• Added a dedicated "Installation" section with explicit instructions for installing via Homebrew, including a code example for the command.
• Introduced a "Usage" section detailing how to use the CLI, including a link to external documentation for further reference.
• Added an "Examples" section showing sample commands for common tasks with the CLI.
• Provided additional information about Homebrew, including links to its documentation and help commands.
• Clarified alternative installation methods and improved the Brewfile example for bundling the tap and formula.

[STRd6]

Thanks!