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  "formats": "Każda podstrona ma dwie wersje z tymi samymi danymi: JSON (adres strony + .json) i markdown (adres strony + .md). Do każdego `url` w tym dokumencie można dopisać .json albo .md.",
  "title": "Serce ciemności",
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  "description": "Transfuzja ciemności czyli Joseph Conrad piszący w głowie Jacka Dukaja \" Heart of Darkness\"",
  "editions": [
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      "subtitle": null,
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    {
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