Adds USPs to livesync docs

[franrob-projects]

This PR:

• Adds temporary USP components.
• Adds short statements within USP components that direct the user to supporting evidence in Ably's architecture docs.

Note that once the copy has been confirmed, I will then add the finished components designed by Lenker.

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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch FTF-450-write-usp-copy-for-live-sync

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[GregHolmes]

This branch isn't building. But I've left some comments, let me know what you think.

[m-hulbert]

I'm not sure the connector itself would restart or experience disruption.

[GregHolmes]

Ok, I've removed the claim on connector restarts. What do you think of the new version in the latest fixup @m-hulbert ?

n/a