Documentation: Elaborate on url and webRoot properties

[DanKaplanSES]

This is a request for clarifying documentation. I don't understand what problem url and/or webRoot solve:

You may want (or need) to debug your application running on a Webserver (especially if it interacts with server-side components like Webservices).

I know when my app needs a running webserver, but I don't understand how these properties relate. I hoped they fired up a web server and served my local frontend files through it. That use case comes up for me all the time, and it's time consuming to have to figure out which web server is the easiest to set up just so I can troubleshoot some HTML/JS's behavior when it's opened locally vs through a server.

I can't tell if that's what this feature does or not. To me, that quote could be interpreted either way. Can the readme include more details about what these properties do and when you need them?

[DanKaplanSES]

@hbenl I'm still learning the ropes of GitHub, so I hope this ping isn't out of line. Given your extensive contributions to the repository, I was wondering if you could share your insights on the issue I've raised. Thanks!