Bill 10: Redirect instead of 403 if user tries to create person twice (PR #248)

A single user cannot have multiple ActivityPub profiles but it is relatively easy to navigate back to a page with "Create Profile" on it after creating your profile. To reduce frustration and confusion this was changed from returning a Permission Denied error to just redirect the user to creating a note with a message describing acknowledging the redirect.
Diff: +8 -5