refactor!: New installation method

[tony]

Changes

New installation method

• Based on generation via ckeditor5-package-tools 2.1.0
  • https://www.npmjs.com/package/@ckeditor/ckeditor5-package-tools/v/2.1.0
  • https://github.com/ckeditor/ckeditor5-package-generator/blob/v2.1.0/CHANGELOG.md
• https://ckeditor.com/docs/ckeditor5/latest/updating/nim-migration/migration-to-new-installation-methods.html
• https://ckeditor.com/docs/ckeditor5/latest/updating/nim-migration/custom-plugins.html

Appendix

• #149