* Adds WooCommerce Endpoints documentation
* Removes images from `woocommerce.com` domain.
* Embed code directly into markdown instead of using gists.
* Adds images to the document.
* Adds changelog file
* Move the document to the right folder.
* Fixes markdown lint issues
We've been quietly building a set of documentation in a private repo that we are ready to move over to the public monorepo so that we can continue our initiative to imrpove the documentation experience for Woo developers.