Remove performance section of FAQs

[franrob-projects]

This PR integrates the performance section of the FAQs into the docs:

• Message durability and QoS (Quality of Service)

• Does the Ably service work in China?

• How much latency does using Ably's adaptors add?

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• Tidy up commit

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Redirects: Here
Jira: EDU-2079
FAQs: Here

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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 EDU-2079-remove-performance-section-of-faqs

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