feat: native helm support

[xopham]

Fixes no issue

Description

• helm values, Chart, and templates are refactored/improved to provide more native helm support and improve usability
• helm and app versioning are properly seperated

:warning: WIP NOTES:

• [ ] Discuss using appVersion as v2.2.0 instead of 2.20
• [ ] Consider further version definitions e.g. k8s
• [ ] ADR 8 on Helm versioning
• [ ] docs
  • [ ] new quick start
  • [ ] new getting started
  • [ ] add versioning notes on start page
• [ ] cleanup helm/values.yaml (adjust defaults, take out examples)
• [ ] add improvements by @annekebr

Checklist

• [ ] PR is rebased to/aimed at branch develop
• [ ] PR follows Contributing Guide
• [ ] Added tests (if necessary)
• [ ] Extended README/Documentation (if necessary)
• [ ] Adjusted versions of image and Helm chart in values.yaml and Chart.yaml (if necessary)

[codecov-commenter]

Codecov Report

Merging #430 (2eba1d4) into develop (bf4de6f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #430   +/-   ##
========================================
  Coverage    94.47%   94.47%           
========================================
  Files           22       22           
  Lines         1105     1105           
========================================
  Hits          1044     1044           
  Misses          61       61           

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