add eslint and fix code issues

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Latest commit: 167058a0d50d59e2b7553a45b21a8281a26f8bc5

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This PR includes changesets to release 6 packages

| Name | Type | | ------------------- | ----- | | react-showroom | Patch | | @showroomjs/ui | Patch | | client-only-example | Patch | | react-example | Patch | | subpath-example | Patch | | react-showroom-docs | Patch |

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