Remove legacy flask-script CLI

[ThiefMaster]

Flask-Script is dead - no release since 4 years and the github repo has been archived, and it's no longer compatible with the latest Flask 2.0 release.

This might be a good opportunity to remove support for it from flask-migrate as well.

[miguelgrinberg]

Yes, this is good motivation to finally do it. Thanks.

[loleg]

Could you, please, remove the Flask-Script section from the docs - perhaps with a deprecation tip (like a link to this article). The release notes should also mention this.

[miguelgrinberg]

@loleg Sorry, forgot to update the docs. All references to Flask-Script are now removed.

[loleg]

Thank you, great!