[WIP] Add a guides section into the navigation

[m-hulbert]

Description

This PR adds a guides section to the existing Ably navigation. It introduces filtering capabilities similar to those used in the examples.

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
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