DCJ-163: Auth Design Overview

[rushtong]

Addresses

https://broadworkbench.atlassian.net/browse/DCJ-163

Summary

Reviewer notes:

• I suggest enabling the "Display the rich diff" option for the markdown file. That will show you what the mermaid diagrams look like:

• If you're viewing this in intellij, look for the Mermaid plugin which supports sequence diagrams.

Notes

The DUOS-branded sign in page still needs to be configured in Consent, but this PR is not blocked on that feature. The customized page is implemented here: https://github.com/broadinstitute/terraform-ap-deployments/pull/1713

---

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[fboulnois]

thank you 👍

[s-rubenstein]

Looks reasonable to me!