Task description

It's time to roll out the new changelog generator in this repository, as the new solution is ready to use (#18051).

See: https://github.com/ckeditor/ckeditor5-dev/releases/tag/v50.1.0.

Definition of Done

• Add a script to create a new changelog entry (nice, New Individual Changelog Entry).
  • "nice": "ckeditor5-dev-changelog-create-entry"
  • It applies to both repositories: CKEditor 5 and Commercial.
• Redesign (and rename: release:prepare-changelog) the changelog generator to use the ckeditor5-dev-changelog package. It should accept two flags:
  1. --date - an optional modifier that defines a release day.
  2. --dry-run - an optional modifier that displays the changelog instead of saving it into the CHANGELOG.md file.
• Rewrite a pull request template to avoid mentioning the old convention.
• Create the changelog directory and a file that allows tracking it by git, even if it's empty.
  • .changelog/.gitkeep
  • Ensure git tracks changes in this directory.
  • It applies to both repositories: CKEditor 5 and Commercial.
• Review and update README.
  • Rewrite the section regarding the changelog preparation.
• Commercial: redesign the nightly release process to generate the changelog using the new format.
• Rewrite the Git commit message convention guide.

Technical details

No response.

Other details

• An example PR introducing the same change in ckeditor5-dev: Integrate the new changelog tool in the repository ckeditor5-dev#1149