* WIP Initial commit of refactored notebooks section.
* Minor additions.
* Finished draft of notebooks quickstart.
* Renamed some files and clarified the notebooks setup doc.
* Updated the guide to custom notebook images.
* A couple more screenshots plus text refinements.
* Fixed references to JupyterHub throughout the docs.
* Updated in response to review comments.
* One more link fix.
* Clarified auth in custom notebooks doc.
* In progress: Refactoring the left-hand navigation panel.
* Added .description to section index pages.
* Removed the redundant Components Overview as the new index page of the components section does a better job.
* Added redirects for the files I've moved/deleted.
* Fixed the URLs in all doc links.
Roy Lenferink
Sarah Maddox
Cong