Wrong description for subcommands

[TilBlechschmidt]

🐛 Bug description

Currently, the description for the subcommands contains some text derived from sub-objects that have been merged into the root options object for each module. See screenshot below.

🦶 Reproduction steps

Steps to reproduce the behavior:

1. Run cargo run -- help

🎯 Expected behaviour

Each module should have a clear and concise description of its function in the help text.

📺 Screenshots

SUBCOMMANDS:
    api             Options regarding the permanent storage backend
    collector       Options regarding the permanent storage backend
    gangway         Options for connection to a storage backend
    help            Prints this message or the help of the given subcommand(s)
    manager         Options for connecting to the Redis server
    node            Options for connection to a storage backend
    orchestrator    Variants of provisioners