Extracted SDK and update requirements and references

[imagobea]

TODO

• Confirm solution for package.json: Sourcing a private repository from a different org requires using a GitHub Personal Access Token (this was the most straight fw solution, there's also SSH). This has been signalled by referencing an ENV var THAT NEEDS TO BE REPLACED MANUALLY (get in touch for the token). The result is that gral public won't be able to clone and run nightfall_3 in the meantime. > Change nightfall-sdk visibility to public

• Check GitHub actions after updating repo visibility 🐞 - pipelines fail >> npm/cli issue #2610, there's a link to a temp solution which suggests to limit npm vs to 6

• Check what to do w/package.json script re sdk > Will (should) live in the SDK repo, relates to:

{
  "name": "cli",
  "version": "1.0.0",
  "description": "A command line interface for Nightfall_3",
  "main": "build/index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "babel lib -d build"
  },
  "dependencies": {}
}

In nightfall_3/cli/package.json.

• README, is CLI still alive?
• Check private repo nf3 dependencies before deleting sdk from here