new format for release (yy:mm)

[wiiznokes]

• [x] use the version field in [package.metadata.packager] https://docs.rs/cargo-packager/latest/cargo_packager/config/struct.Config.html
• [x] use the version in clap. So the version should be accessible using an env var.
• [ ] use a changelog: https://github.com/iced-rs/iced/blob/master/CHANGELOG.md
• [ ] use the changelog in metadata file : https://docs.flathub.org/docs/for-app-authors/metainfo-guidelines/#release