Follow up to https://github.com/stackabletech/documentation/issues/282 Explain for every operator: - which roles does it have and what do they mean? - Which resources does it create: - i.e. statefulsets per role - configmap for discovery - also a diagram - which resources does it tear down again? - for example, ConfigMaps and PVCs are staying - what are the dependencies, what other operators does it connect to? - link to demos Operators: - [ ] commons - [ ] secret - [ ] listener