Use first free port

[xavortm]

If I have 3000 in use, it will create a live reload setup that uses that port, which would redirect me to a project that is already running. I have to manually update the webpack configuration to a free port instead.

The request if I can call it that way here would be to "ask to use free port XXXX", hit enter/y and go with that (like CRA does it)

[Dugnist]

ok, I'll try to add this.