Leverage the work already done by the Hibernate team by:
git clone https://github.com/quarkusio/quarkus.wiki.git
See the contained Migration-Guide-3.0:-Hibernate-ORM-5-to-6-migration.asciidoc file and reuse as much content as possible.

^ was pushed to https://github.com/scottmarlow/wildfly/tree/orm6migrationdoc with the original content which will change.