Integrate B2C Auth with UI

[garrett-fearless]

Description: B2C authentication needs to be integrated with the UI to login and use the API.

#142 must be completed before this.

AC:

• Documentation updated
• Testing updated
• Login uses B2C auth

[tabrez-aziz]

Leaving this ticket under "Ready to Refine" until #142 has been completed. We will size it once #142 is closed/done.