Prettier formatting our markdown files is causing bugs because of the
differences between Gatsby's parser and Prettier's. Also, Prettier
formats the inline code-blocks containing example CMS configs, but the
formatting it uses doesn't really make much sense or match the suggested
CMS config style.
It doesn't actually make much sense to format the docs anyway, since we
use the CMS itself to edit/generate them.
When loading Netlify CMS via script tag from a CDN, the file was named
`cms.js` until 2.0, when it was renamed to `netlify-cms.js` in alignment
with all packages outputting files that match the package name. To avoid
a lot of broken sites and confusion, this commit outputs both filenames
and prints a deprecation warning to the console in `cms.js` only.
