Provide Path Mappings for debugging

[nico-loeber]

Discussed in #54

^{Originally posted by nico-loeber May 19, 2022}
To allow zero configuration debugging from a browser a path mapping is required.
It looks like a deployment configuration is required to do so. A "local or mounted folder" deployment with a path mapping project directory => /var/www/html could be added to do so.

[nico-loeber]

I've added a deployment configuration containing a path mapping for the mounted ddev container.
Sadly PHPStorm refuses to use this mapping. Hope to get some feedback on this issue: https://youtrack.jetbrains.com/issue/WI-55140