chore: rebrand AdminBro to AdminJS

[danklewicz-swb]

This commit is a part of AdminBro to AdminJS rebranding process.

BREAKING CHANGE: AdminBro has been rebranded to AdminJS. All package and repository names had been updated.

Migration Guide

1. Update your dependencies to use new adminjs packages.
   • admin-bro -> adminjs for the core package
   • @admin-bro/<package name> -> @adminjs/<package name> for other modules
2. Update your custom CSS classes:
   • .admin-bro_<component name> -> .adminjs_<component name> (example: .adminjs_Box)
3. Search your project for admin-bro occurrences - most likely they will have to be updated to adminjs

[github-actions[bot]]

:tada: This PR is included in version 2.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: