The official documentation is due for an update, but some of it is still valuable. Scripted automation is included in the new rule engine. For now, the best documentation for installation is in the helper library repository, which is the . There is even a section for docker, even though the actual installation is the same.
However, you could also try out the beta Jython bundle…
Yes. If you have the new rule engine installed, then you already have it.
No. I recommend not using the files from that second link. They are very dated compared to the helper libraries.