Add navigateToChanged option to new dev server #125

New server works brilliantly.

Opening a new issue as 11ty/buildawesome#1305 is closed.

Would it make sense to add an option like navigateToChanged?

When you work on multiple pages/blog posts it comes in very handy if your server and browser just jump to the most recently edited page. (I know Hugo’s server supports such an option.)

Thank you!