Move published docs (netlify/netlify-cms-www) into this repo

[verythorough]

- Do you want to request a feature or report a bug?
Feature

- What is the current behavior?
The markdown files for docs are currently duplicated in two places: here in /docs, and in netlify-cms-www, which is the repo behind netlifycms.org.

- What is the desired behavior?
Not maintaining docs in two places! 😄 We could consider a webhook/submodule solution to keep things synced in both places, but I think I'd prefer to keep the docs in one place, with the code. Thoughts?

The current netlifycms.org repo seems a bit bulky to store in the code repo, so the change will probably involve either simplifying netlify-cms-www, or splitting docs from "marketing" content, and building the docs from a folder in netlify-cms to something like docs.netlifycms.org.

[bdougie]

I would love to try out https://github.com/DavidWells/markdown-magic

I believe it would only require us to add it to the cms-www and pull the docs from this repo. I am a believer that the docs should live near the code and don't need to nbe in the cms-www.

I will explore this tomorrow and report back

[verythorough]

This is currently being handled in the netlify-cms-www repo using bdougie's markdown magic suggestion. We may choose a different strategy in the future, but I think we can close this issue for now.