[INF-5971] Add latency architecture page

[emptyhammond]

Description

WIP: Add Latency page to the platform architecture documentation. Images will be swapped out for embedded Metabase reports in due course.

• https://ably-metabase.herokuapp.com/dashboard/1346-latencies-cross-region
• https://ably-metabase.herokuapp.com/dashboard/1347-latencies-real-browser

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• 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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[mattheworiordan]

This is awesome, nice work @emptyhammond .

Initial thoughts are:

• We shoudl be a bit more punchy in selling ourselves. Hpapy to loop in marketing to help?
• We have a Performance section in our docs, yet we're not linking to this, and vice versa. Should we consolidate / cross link?

[emptyhammond]

Couple of minor comments @m-hulbert - I'll get the dashboards embedded properly and then I think we're good to go.

[emptyhammond]

Hi @m-hulbert - I've updated this now with the embedded Metabase dashboards. Please take a look and offer any feedback.