chore: migrate to upstream chart

[ericwyles]

Description

Update to use upstream chart.

Related Issue

Fixes #16

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Other (security config, docs update, etc)

Checklist before merging

• [x] Test, docs, adr added or updated as needed
• [x] Contributor Guide Steps followed

[ericwyles]

• upstream and registry1 flavors both passing CI
• I can locally log in to gitlab.uds.dev with the default root password on both flavors (screenshot)

[ericwyles]

This link has a diff of helm template against

• Left: Repo1 chart + common values + registry1 values
• Right: Upstream chart + common values + registry1 values

For posterity: https://editor.mergely.com/kthtnQGb