Docs: Add links to npm packages in typescript-eslint/packages/*

[JoshuaKGoldberg]

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• I have looked for existing open or closed documentation requests that match my proposal.
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Suggested Changes

I just noticed that package docs pages like https://typescript-eslint.io/packages/eslint-plugin never actually link to the npm packages like https://www.npmjs.com/package/@typescript-eslint/eslint-plugin. It'd be a nice convenience for them to add that link.

Maybe, the common kind of npm badge image a lot of projects use, like from shields.io? Note that we should self-host the image (i.e. have a React component) so we don't take a dependency on the external service.

Affected URL(s)

https://typescript-eslint.io/packages/*