metrics docs

[mayberryzane]

Summary

• add docs for metrics, including the dashboards and graph editor

How did you test this change?

• clicktested locally

Are there any deployment considerations?

• uses the same url (/docs/general/product-features/metrics/overview) as pointed to by the landing page

Does this work require review from our design team?

• no

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Latest commit: 322cb56

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