* 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.
* Restructured the pipelines docs.
* Added redirects for the deleted files.
* Standardized use of full stop in descriptions.
* More full stops.
* Fixed internal links to the moved pages.
Roy Lenferink
Sarah Maddox