dream2nix v1 API

!!! This document does not resemble the current API of dream2nix. It is only a draft and the real implementation differs. More docs will follow.

• problems of the current dream2nix
• users of dream2nix
• v1 API examples:
• package maintainers:
  • project initialization
  • workspaces
  • multiple repos
  • monorepo
• consumers:
  • inspect package options
  • override packages
• integration maintainers:
  • integrate lang2nix tool (pure)
  • integrate lang2nix tool (code-gen/impure)