feat(helm charts): remove csctl template notation

[jschoone]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #85

Special notes for your reviewer:

Just changed it everywhere even if we will merge the Cluster Stacks, just to not copy this somewhere else.

TODOs:

• [ ] squash commits
• [ ] include documentation
• [ ] add unit tests