feat: Add update-merics-doc script

[CatherineF-dev]

What this PR does / why we need it:

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)

Which issue(s) this PR fixes: (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged)
Fixes #3023

You can see generated website here kubernetes/website#56294

[linux-foundation-easycla]

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• ✅ login: CatherineF-dev / name: Catherine Fang (6eef51b)

[kubernetes-prow]

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[bhope]

Blocked by #3002