ZooKeeper mode has been deprecated in Kafka for quite some time now, and it has been fully removed in AK 4.0. The Debezium tutorial still shows running Kafka with ZK, which makes things more complicated than necessary, also making the tutorial look a bit dated. Let's therefore update the tutorial to KRaft mode. To do:

• Update https://debezium.io/documentation/reference/stable/tutorial.html to use KRaft mode, remove any mention of ZK
• Update https://debezium.io/documentation/reference/stable/tutorial.html to use the latest image version consistently; it is using 3.0 in several places
• Update the tutorial example at https://github.com/debezium/debezium-examples/tree/main/tutorial to use KRaft mode; remove the existing KRaft flavour in that README.md, as it is going to be the one and only mode used for all the flavours
• Optional: update other examples in debezium-examples to use KRaft mode; not sure how much time should be spent on it, considering the examples are maintained best-effort style only