Spin up a public docs site

## Description

As a model user, model author, or caikit contributor, I want to open caikit.org and find documentation that helps me

## Discussion

Long term hosting TBD, initially we'll probably want to throw some stuff in gh-pages.

Should gh-pages be hosted here in caikit/caikit or in another public docs repo?

## Acceptance Criteria

- [ ] caikit.org points to a site we manage