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

* added link to edit on GitHub
* Changed image source on homepage
* Made some changes to the structure, added the ability to have l3 navigation. Added warning, note and other styles.
* Fixed an image link, removed the .. :content: links because they were quicky and didn't look good, added pagelinks to current page of other versions.
* Moved the remote client api's to their own doc
Merge pull request #2035 from dhrp/style-revamp

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