Rebuilds README to include release notes from Chart.yaml via gluon template

General MR

Summary

Second attempt to add some standard ### Upstream Release Notes text in the README for the ongoing renovate epic. Previously I'd added this by hand, forgetting that I'd need to update gluon to make it stick (gluon rolled it back in the next MR: !254 (merged)). I've updated gluon, so we should be able to lock this in.

Relevant logs/screenshots

❯ make update-readme
curl -sLO https://repo1.dso.mil/big-bang/apps/library-charts/gluon/-/raw/master/docs/README.md.gotmpl
curl -sLO https://repo1.dso.mil/big-bang/apps/library-charts/gluon/-/raw/master/docs/.helmdocsignore
curl -sLO https://repo1.dso.mil/big-bang/apps/library-charts/gluon/-/raw/master/docs/_templates.gotmpl
docker run --rm  -v "`pwd`:/helm-docs" -u 501 jnorwood/helm-docs:v1.14.2  -s file  -t /helm-docs/README.md.gotmpl -t /helm-docs/_templates.gotmpl --dry-run > README.md
time="2024-07-24T21:17:32Z" level=info msg="Found Chart directories [chart]"
time="2024-07-24T21:17:32Z" level=info msg="Generating README Documentation for chart chart"
rm .helmdocsignore README.md.gotmpl _templates.gotmpl

Linked Issue

N/A

Upgrade Notices

N/A