* feat(courses): Add playlist curso json @equiman

Resource: Curso JSON - De novato a Experto
Playlist: https://www.youtube.com/playlist?list=PLrDTf5qnZdEAiHO19QB9hq5QXAef1h8oY
Slides: https://slides.com/equimancho/json
Creator: Camilo Martínez "Equimancho" @equiman

* chore(courses): remove slides link and platform

via https://github.com/EbookFoundation/free-programming-books/pull/5536#issuecomment-919418962