Changes to a new style for the docs. Includes version switcher.

This PR does a mayor overhaul of the docs style. 

A preview is available here:
http://docs.docker.io/en/doc-style-update/

* added link to edit on GitHub
* Changed image source on homepage
* Added the ability to have l3 navigation. Added warning, note and other styles.
* Made some changes to the structure, 
* Removed the .. :content: links because they were quicky and didn't look good
* Added links to (the current document) on other documentation versions
* Moved the remote client api's to their own doc