Improve INVITED account onboarding.

When inviting a Team member, the onboarding wizard should not be the standard one.

Instead, a simple "Do you accept this invitation" type of wizard should be sufficient.

Rationale:

When inviting one of our team members, she indicated "Yes, we hiring" (by which she meant, "Yeah, there's hiring happening at the moment") and the platform created a whole new Company that we need now to delete.

This created some initial confusion until we figured out that a new company (with the same name, obviously) had been created.