- Update README.md to reference /opt/ssl for SSL certificate paths
- Update docs/demo-environment.md to use /opt/ssl paths
- Clean up scripts/configure_gateway.sh SSL fallback paths
- Remove duplicate and outdated SSL path references
- Establish /opt/ssl as the standard SSL certificate location
This ensures consistent SSL certificate management across all
documentation and scripts, supporting the established /opt/ssl
directory with proper ubuntu:ubuntu ownership.