U2F/MFA Support

[craigmayhew]

Why are you submitting this feature request
Accounts are not currently protected in the event of the password database becoming public, or if the individual account holder has their password compromised.

Describe the solution you'd like
Yubikey support.

Describe alternatives you've considered
Please don't use SMS.

Additional context
The account is worth protecting. It contains:

• Personal data.
• IPNS records can be maliciously updated to break/redirect deployed IPFS sites/apps/data.