* Allowing auth secrets to be optional
* Add value secret.existingSecret for clearml chart.
* Add value clearml.existingAgentk8sglueSecret for clearml-agent chart.
* Add value clearml.existingClearmlConfigSecret for clearml-agent chart.
* Split Secret clearml-agent-conf in clearml-agent chart into two
Secrets: clearml-agent-conf (agent.conf file) and clearml-agent-k8sglue
(environment variables).
* Update helm-docs