Prepare the package for release and release it

[psmyrek]

Recent changes from https://github.com/ckeditor/ckeditor5-angular/pull/328 requires Angular 13. Because of that, the following actions are needed before releasing the new package:

• Update CKEditor 5 docs about supported Angular versions. Let's add descriptions for the following releases
  • 3.0.0 (due to bumping the minimal version of Node.js), it should support Angular 9.1+.
  • 4.0.0 requires CKEditor 5 at least in version 34. Please, read MAJOR BREAKING CHANGES.
  • 5.0.0 (the release containing #328) - For Angular 13+ applications.
• Update README.md about supported Angular versions.
  • More or less the same scope of changes like we did in the component guide.

And then release the package.