Add global config file for onboarding

[iannesbitt]

Things to potentially include in global config:

• [ ] schema.org MN endpoint
• [ ] CN endpoint
• [ ] latest CN token?
• [ ] CN user account name for writing scp xml command(s)
• [ ] Default settings.json settings for server
  • [ ] log level (INFO for prod and DEBUG for staging)
  • [ ] default level for AUTOTHROTTLE_TARGET_CONCURRENCY
  • [ ] additional needed default settings