"Meta" Helm chart for ORC

[MridulS]

We have now helm chart for gesis binder and gesis hub.

• Learn more about helm releases and rollback
• Make helm chart for gallery
• Make helm chart for orc-site -> here mount html templates as configmaps too
• Finally make a orc helm chart for whole project (similar to mybinder.org-deploy chart), which requires all other charts/apps (including storage, monitoring, gesis binder, hub, gallery charts...). So we can have 1 values.yaml for whole project?
  - For example we can also have GESIS templates (and statics?) in a configmap and all apps use that configmap.

[Moved from GitLab]