chore: move playground to eslint-online-playground
This PR is part of #824. It represents the first step in the omnisite.
In this update, I switched playground to eslint-online-playground. The transition to twoslash-eslint
will be made in the next PR. After tht I think we can remove all ESLint runners from the documentation site to simplify the build process.
Latest commit: 60dbacd
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