Clarify expected Juju controller setup between how-tos #78
Description
The How to initialize cloud environment page instructs users to add their K8s cloud to their existing controller so both the K8s and machine clouds exist on a single controller. However, the Integrate with Canonical Observability Stack how-to starts with the assumption that separate controllers are used for the K8s and machine clouds.
Users who follow the Initialization how-to and then the Integration how-to will be in a different initial state than expected. As a result, they will need to modify the instructions to deploy COS (specifically, recognize that their cos-controller and charmed-hpc-controller are one and the same). This takes them off the path of the documentation, potentially leading to difficulties getting deployed.
We should provide guidance on best practice, explaining when use of single and separate controllers are appropriate in Charmed HPC, and we should be consistent with controller setup between how-tos.