Add push notifications page to AI Transport

[GregHolmes]

Description

• Adds a new feature page for push notifications under AI Transport > Sessions & Identity
• Covers agent-side patterns for notifying offline users via Ably's Push Admin API
• Includes opt-in patterns, presence-based conditional sending, multi-device awareness, deep linking payloads, and a complete end-to-end example
• Adds navigation entry in the Sessions & Identity section

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch AIT-211-Feature-documentation-push-notifications

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