Document token expiration and rotation

[matt423]

Summary

• Add token expiration section covering expiry options (30/60/90 days or none), behavior on expiry, and reminder emails.
• Add token rotation section with step-by-step workflow.
• Update the create token steps to include the expiry selection.

Review App

Test plan

• Verify the page renders correctly with yarn develop.
• Confirm section anchors (#expiration, #rotate) link correctly.
• Review against the feature PR (ably/website#8058) for accuracy.

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dx-982-token-expiry

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