webapp: embedded JupyterNBViewer with the same UI elements as the usual JupyterNBViewer
webapp: embedded JupyterNBViewer with the same UI elements as the usual JupyterNBViewer

sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,sagemathinc/smc,sagemathinc/smc