remove docs to separate repo

[tongueroo]

This is a 🙋‍♂️ feature or enhancement.
This is a 🧐 documentation change.

• I've added tests (if it's a bug, feature or enhancement)
• I've adjusted the documentation (if it's a feature or enhancement)
• The test suite passes (run bundle exec rspec to verify this)

Summary

Move docs to separate repo: https://github.com/boltops-tools/jets-docs

Pros and cons of doing this:

• Con: Like having contributors getting credit for the main repo.
• Pro: Reduces the noise level with code changes. Can focus more on the jets code.
• Pro: Allows big deploys like major releases to more control over when to release doc changes.