Feature: Monorepo

[estebanprimost]

This PR:

• Organizes the old repo on packages:
  • chan: chan-cli entry.
  • chan-core: This is the api core. It does the real work. Has the writer (stdout/file).
  • chan-errors: Shared errors.
  • chan-parser: MD parser stuff.
• Adds lerna to handle monorepo.
• Uses rollup to build bins and dists (cjs by the moment, but other formats will come)
• Updates dependencies.
• Closes: #14
• Closes: #15
• Closes: #16