Update helm-install.sh to include CHART_LOCATION (#29)
When users follow the installation instructions and download the script using: curl -so /tmp/helm-install.sh https://raw.githubusercontent.com/cardano-foundation/cf-helm-charts/refs/heads/main/charts/cf-idw/helm-install.sh The script fails to execute because it references a local chart directory (.) that doesn't exist in the user's current working directory. This change introduces the CHART_LOCATION variable to make the chart reference configurable. The default remains . to preserve the original behaviour for repository-based workflows, but users can now override it to reference the remote Helm repository.