Document MFA reset procedure
This is currently only documented here: https://gitlab.archlinux.org/archlinux/infrastructure/-/wikis/meetings/2020-09-05#user-forgot-their-mfa-flow
Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
This is currently only documented here: https://gitlab.archlinux.org/archlinux/infrastructure/-/wikis/meetings/2020-09-05#user-forgot-their-mfa-flow