fix(cli): move serverKey and serverCert under http

[danielpeintner]

Note: the PR also removed the following from "servient"

            "dependencies": {
                "serverKey": ["serverCert"],
                "serverCert": ["serverKey"]
            }

since

• dependencies are now dependentRequired and dependentSchemas
• and deals with subschemas which we don't use

Am I wrong?

fixes #839

[danielpeintner]

Note: The MQTT tests are failing again and do not recover. I don't think it has anything to do with this PR.
https://github.com/eclipse-thingweb/node-wot/actions/runs/8800424907/job/24189040521#step:9:418