create-profile.sh: copy more stuff from the current profile to the new one

The "drupal generate:profile" command only provides a stub
implementation for the .install and .profile files which are only fine
when writing a new installation profile from scratch.

When creating a profile form an installed one, it is appropriate to
preserve as much as possible of the original profile, so copy code and
data from the currently installed profile to the newly created one,
adjusting them to the new profile name.