Created by: exalted
Open a specific URL instead of hard-coded / path.
For example, BROWSER_URL='http://localhost:3000/admin' react-scripts start, would open http://localhost:3000/admin in user's default browser, instead of http://localhost:3000/ (that is if custom PROTOCOL, HOST, and PORT are not provided).
This aligns perfectly, in my opinion, with existing behavior of opening with a different browser (i.e. BROWSER='google chrome' react-scripts start).
What do you think?