Issue #3442271: Replace text format setup with custom CKEditor plugin

config/install/insert.config.yml

config/schema/insert.schema.yml

css/ckeditor5.admin.css

css/images/extend-allowed-html.svg

insert.ckeditor5.yml

insert.libraries.yml

insert.module

insert.update.php

js/Handler.js

js/plugins/ckeditor5.js

modules/insert_colorbox/insert_colorbox.module

...es/insert_responsive_image/insert_responsive_image.module

src/Form/ConfigForm.php

src/Utility/InsertUtility.php