Add README.md link to JS docs for users redirected here from older tools

[mikemaccana]

Old, NFT specific tools are marked as deprecated, and the docs point to https://www.npmjs.com/package/@metaplex-foundation/umi, but those docs are general Umi docs, rather than NFT docs.

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Latest commit: 92d690e

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Name	Status	Preview	Comments	Updated (UTC)
umi-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 28, 2024 4:30pm