Move stable/charts issue to file, to help community relocate charts t…

…o new repos

- Helm dev meeting action item:
  https://docs.google.com/document/d/1d-6xJEx0C78csIYSPKJzRPeWaHG_8W1Hjl72OJggwdc/edit#heading=h.ayp8tsp2dvg6
- Original issue: https://github.com/helm/charts/issues/21103
- New issue location: helm#232

Signed-off-by: Scott Rigby <scott@r6by.com>