custom helm-docs template, and docs update

General MR

Summary

proper helm docs can now be created using helm-docs templating

docker run --rm -v "$(pwd):/helm-docs" -u $(id -u) jnorwood/helm-docs:v1.5.0 -s file -t helm-docs/README.md.gotmpl --dry-run > README.md

Partially related to https://repo1.dso.mil/platform-one/big-bang/pipeline-templates/renovate-runner/-/issues/8