add ability for custom tld

[sboissez]

This should handle non-.com TLD's as well.

For example in our org we use a custom domain for Okta that this recipe wont be able to handle with .com hardcoded into the URL

This is the same pattern as used in the Okta terraform provider with an org_name and base_url variable: https://registry.terraform.io/providers/okta/okta/latest/docs#org_name

[nstrauss]

Good callout. Fixed one issue.