Document the use of the cluster chart

[Rotfuks]

Motivation

Now that we introduced the cluster chart and already use it in capa we need to make sure that there is documentation out there explaining how to use the cluster chart and what to take into account when working with the cluster and cluster-aws charts.

Tasks

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1. Add basic documentation to cluster chart that enables Team Turtles team members to understand the cluster chart better.
2. Add basic documentation to cluster chart that enables provider integration team members to understand better how their cluster provider apps are using the cluster chart.

Outcome

• we have sufficient documentation explaining the use of the cluster chart and it's context within the cluster- charts to internal engineers to ensure operational excellence.