Change opt-out behavior to opt-in

This is a proposed solution for adding opt-in functionality. In much the same way as the opt-out solution, this is pretty annoying.

The major difference is that it allows users to give consent. It's clear that many people don't want their resume to be generated by this app. Whatever their reason, it's not their responsibility to inform the maintainers of this app of their lack of consent after the harm has been done.