Consider define the default repository URL if not provided

[bkmeneguello]

If no source is provided this module should behave just like helm executable and use by default

source:
  type: repo
  location: https://kubernetes-charts.storage.googleapis.com

This would be simpler and more intuitive.

[avorima]

Shouldn't this be set in the Ansible module instead? I think the package shouldn't enforce a default like this.