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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": "Amazing Performers. Intermediate 3 (B1). Collins English Readers",
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  "description": "Poziom 3 - B1. The inspiring stories of 6 people who changed history. Contents: Pablo Casals, the Catalan cello-player. Louis Armstrong, the American trumpet-player and singer. Frank Sinatra, the Italian-American singer and actor. Édith Piaf, France's famous singing star. Maria Callas, the...",
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    {
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      "subtitle": null,
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