After the repository migration from janus-idp/helm-backstage to redhat-developer/rhdh-chart (RHIDP-1477), internal Helm template functions still use the "janus-idp" prefix, which is confusing for users viewing values.yaml.

Files affected (may not be limited to):

• charts/backstage/templates/_helpers.tpl (3 template functions)
• janus-idp.hostname
• janus-idp.backend-secret-name
• janus-idp.postgresql.secretName

• charts/backstage/values.yaml (7 references)
• charts/backstage/templates/route.yaml (1 reference)
• charts/backstage/README.md and README.md.gotmpl (documentation)

Example of Suggested rename:

• janus-idp.hostname to rhdh.hostname
• janus-idp.backend-secret-name to rhdh.backend-secret-name
• janus-idp.postgresql.secretName to rhdh.postgresql.secretName