Cylc 8.0b1 released

Experimenting with cylc8 on one of my HPC systems. This system has a two factor authentication and so the instructions for logging into JupyterHub won’t work. However the system also has a dedicated JupyterHub server that understands the authentication and I can log into that. The question is - once I have logged into that JupytherHub how do I invoke the cylc-ui?