Remove migrating section of FAQs

[franrob-projects]

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

• Can you help ease the pain of migration from another Data Stream Network?

• How does Ably compare with PubNub?

• Is it easy to migrate from PubNub to Ably?

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• Tidy up commit

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Redirects: Here
Jira: EDU-2081
FAQ: 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-2082-remove-migrating-section-of-fa-qs

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[franrob-projects]

@m-hulbert ready for another look over!!