cli: add available subcommands to help
I've forgotten too many times the names of the commands, this makes it obvious which ones can be called.
This instance will be upgraded to Heptapod 1.5.0rc (GitLab 16.11.1) on 2024-05-02 at 15:00 UTC+2
I've forgotten too many times the names of the commands, this makes it obvious which ones can be called.