MFA + U2F authentication support

Checklist

[x] I have read and agree to the README (found on https://github.com/Minehut/Meta)
[x] This is not a bug report, support request or plugin request
[x] I have searched the Issue Tracker to make sure this is not a duplicate issue
[x] This issue does not contain any sensitive information

Platform

Describe the feature

Set up MFA authentication (with support for U2F devices) with Minehut's authentication provider (Auth0)

How the feature is useful

Multiple authentication steps lower the risk of getting your account compromised. Physical U2F devices lower the risk even further.

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Minehut / Meta