Fix broken docs/api link

[flexdinesh]

The API link is broken in our newsletter signup email and website footer. We don't have an API reference anymore since we moved the APIs to their own fields. So now we're redirecting the old links to /config/overview which has a set of links to all available APIs.

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Latest commit: 4da68c3

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Name	Status	Preview	Updated
keystone-next-docs	✅ Ready (Inspect)	Visit Preview	Oct 12, 2022 at 0:28AM (UTC)

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