• Remove sagenb as a documented argument to the sage-notebook script, and remove the code to start the SageNB server.
• Rewrite the error when sagenb is passed as an argument.
• Change the default from SageNBExport to NotebookJupyter.

Component: scripts

Author: John Palmieri

Branch/Commit: f5853f9

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/29885