We'll store hashes for the last 5 passwords, fetch them all for the user
wanting to change their password, and make sure the password does not
verify against any of the 5 stored hashes.
Includes some password-related UI/UX improvements and refactors. Also
some fixes related to reset password rate limiting (instead of an
unhandled exception), and token expiration on error.
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Co-authored-by: Nuno Góis <github@nunogois.com>
