Create instructions for setting up Django admin through Cognito SSO

[ethanstrominger]

Dependencies

• Enable SSO for admin screen #323

Overview

Write documentation on how to configure system to log on to Django admin using SSO.

Technical implementation

After 323 is implemented and merged to main try implementing SSO. This will involve:

• creating an app in Amazon Cognito
• setting callback URLs in Cognito
• defining COGNITO variables specified in .env.docker-example
• new users will require email verification. Use any gmail address and different "users" can be created for a gmail account by either adding a period (.) or prefixing with #. For instance, ethanstrominger2@gmail.com, ethan.strominger2@gmail.com and ethanstrominger2#try1@gmail.com will all work.