Terraform variable `parser_container_urls` is unused (I think?)

[davidstanke]

Hey @rogerthatdev -- in /terraform/example/variables.tf, I see reference to a map variable called parser_container_urls. But as far as I can tell, that variable isn't actually used. Instead, each of the parsers has its own variable: circleci_parser_url, gitlab_parser_url, etc.

Am I reading it correctly? If so, we should remove that variable from this example. And we should probably add all of those other variables (yeah?).