Document MFA over SSH and API

[AnouckColson]

Why

MFA will soon be enabled at organization level and will cover both SSH and API connections. The feature will be available for Enterprise/Elite on PSH, and as part of the user management sellable on Upsun.

What's changed

• Created a Security section under Administration to gather the MFA and SSO pages.
• Reworked the MFA page to describe target behaviour.
• Updated other places in the docs that referred to MFA and MFA-related error messages, added links to redirect users to the dedicated page.

[github-actions[bot]]

Your Platform.sh environment has successfully deployed. :rocket:

See the changed pages:

Platform.sh docs

- [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security/mfa.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh/troubleshoot-ssh.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security/sso.html

Upsun docs

- [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/mfa.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/billing/add-on-subscription.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/users.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh/troubleshoot-ssh.html

[github-actions[bot]]

Your Platform.sh environment has successfully deployed. :rocket:

See the changed pages:

Platform.sh docs

- [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security/mfa.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh/troubleshoot-ssh.html - [ ] https://mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security/sso.html

Upsun docs

- [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security/mfa.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/administration/security/sso.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh.html - [ ] https://docs.upsun.com.mfa-ssh-api-ceo4owy-ucq44jg6ofare.eu-5.platformsh.site/development/ssh/troubleshoot-ssh.html