ENG-6418 - SSO for Best Self Academy

- source :: https://15five-dev.atlassian.net/browse/ENG-6418

Description

As a 15Five user, I'd like to easily sign into Best Self Academy because I'm already a 15Five user and I shouldn't have to sign in twice.

Acceptance Criteria

- Ability to sign into Best Self Academy from 15Five

- Signing out from 15Five results in being signed out from the Best Self Academy

- Ability to sign into Best Self Academy from 15Five to be enabled or disabled from Django

- Link to so Thinkific site to be at bottom of the 15Five home page

Notes

- The execution of this user story will be dependent on ENG-6421: [SPIKE] JWT techCLOSED

- Do we need another ticket to have a feature flag to enable/disable at the customer level? We'll need a feature flag so either we add AC to this ticket or create a new ticket

- This AC -> Link to so Thinkific site to be at bottom of the 15Five home page was discussed during a huddle when this ticket was groomed

- Proof of Concept PR: https://github.com/15five/fifteen5/pull/26411