Issue #3099923 by arpeggio: Improved documentation on CKEditor Upload Image installation using composer.
Issue #3099923 by bahuma20: Implemented composer-merge-plugin for libraries.
Issue #3095048 by arpeggio: Refactor changed deprecated codes.
Issue #3095048 by Sergiu Stici: Fixed deprecated codes.
Issue #3091954 by arpeggio: Changed package name from "User Interface" to "CKeditor".
Issue #3067117 by arpeggio: Fixed "Undefined index: media_entity_image".
Issue #3076076 by arpeggio: Fixed "The "media" entity type does not exist" error.