Improve Kangal installation process

[lucasmdrs]

Report persistence does not work with default installation.due to the predefined values for KANGAL_PROXY_URL, see example in #122

We should try to build the URL based on the context information during the chart installation or provide some detail about non available functionalities due to missing configuration as mentioned in #193

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.