feat: make init both interactive and args driven

[f1ames]

This PR improves init command. See #4.

Changes

• Rework init command to be both interactive and args driven.
  • It's interactive when no args are passed.
  • Args driven if any arg is passed.
• Introduced args:
  • --framework (-f)
  • --schema-version (-v) (since version is reserved keyword)
  • --overwrite (-o)

Fixes

• Kubernetes version can be now passed with and without v to version prompt.
• Framework is not required by prompt/wizard now (without it, default configuration will be used).

Checklist

• [x] tested locally
• [ ] added new dependencies
• [x] updated the docs
• [ ] added a test