introduce a simpler set of bundled extensions

[acao]

• introducing a happy path for those who want a simple setup
• switch example to use the simpler approach
• update docs to reflect this

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Latest commit: 049d83aadb1d33ef281e337e7368b439d6505cba

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| Name | Type | | ---------------------- | ----- | | codemirror-json-schema | Patch |

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