Problem (FLPATH-3146)

The main README.md instructs users to add the helm repo with helm repo add cost-onprem https://insights-onprem.github.io/cost-onprem-chart, but this fails with 404 Not Found because:
- No index.yaml file exists in the repository
- GitHub Pages is not properly configured for the helm chart repository
- oc-mirror cannot mirror the chart and related images without a proper helm repository

Solution

Setup proper GitHub Pages and helm repository infrastructure to enable helm repo add command and oc-mirror support.

Acceptance Criteria

• [ ] Create and configure GitHub Pages for the cost-onprem-chart repository
• [ ] Generate index.yaml file for helm repository
• [ ] Setup automated release process that updates index.yaml
• [ ] Verify helm repo add cost-onprem https://insights-onprem.github.io/cost-onprem-chart works
• [ ] Verify oc-mirror can successfully discover and mirror the helm chart
• [ ] Update documentation with correct helm repo instructions
• [ ] Test end-to-end helm install from the new repository

Definition of Done

• Helm repository is accessible via GitHub Pages
• oc-mirror can successfully mirror the chart for disconnected environments
• Documentation is updated and verified