[FTF-468] Auth Phase 2

[umair-ably]

Description

• Moves Auth docs under Platform
• Updates redirects

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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[m-hulbert]

Before I review this Umair; I think we need to have a page on authentication in Pub/Sub like we've done for Chat and Spaces when this moves out to Platform.