https://github.com/cccties/chilo-producer/wiki/e00.Structure-of-CHiLO-Book
https://github.com/cccties/chilo-producer/wiki/e01.Production-of-CHiLO-Book
https://github.com/cccties/moodle-theme_chilo/wiki/e02.How-to-create-quizzes-for-CHiLO-Book
https://github.com/cccties/moodle-theme_chilo/wiki/e04.How-to-create-digital-badges-for-CHiLO-Book
https://github.com/cccties/moodle-theme_chilo/wiki/e03.How-to-create-forums-for-CHiLO-Book