docs for 2 factor authentication

[patrinoua]

This PR adds links to the docs on how to set up 2fa

Description

QA Test Case(s)

Test Case	Feature	Environment	Acceptance Criteria	Setup Instructions/Link

PR Checklist

• [ ] I tested my changes on iOS / Android.
• [ ] I added screenshots or videos to illustrate my changes.
• [ ] I added Tests and Stories for my changes.
• [ ] I added an app state migration.
• [ ] I hid my changes behind a feature flag.

To the reviewers 👀

• [ ] I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

Changelog updates

Cross-platform user-facing changes

iOS user-facing changes

Android user-facing changes

Dev changes

Need help with something? Have a look at our docs, or get in touch with us.

[artsy-peril[bot]]

	Warnings
:warning:	Please assign someone to merge this PR, and optionally include people who should review.

Hi there! :wave:

We're trialing semantic commit formatting which has not been detected in your PR title.

Refer to README#327 and Conventional Commits for PR/commit formatting guidelines.

Generated by :no_entry_sign: dangerJS against ead4350e17224af15a16fbc9e5eb2bf9f87ae15d

[MounirDhahri]

Are there still changes required here?

[pvinis]

lol, i love the random ci failure. ill rerun it so its green and ready.

[damassi]

Can we merge or close this?