Aequetas wrapper should detect host, since handling of HTML / IFrame is different in jupyter lab, jupyter hub, and vscode.

[gbowlin]

          While this is good for caching, and makes sure that any javascript for the new html segment gets run, it does have two drawbacks:

1. VSCode does not support loading an IFrame source from disk - IFrame not rendered in notebook output microsoft/vscode#154722
2. JHub requires some handling for this to propagate to jupyter lab instances - https://stackoverflow.com/questions/60257156/not-able-to-embed-jupyterlab-running-on-jupyterhub-into-an-iframe

Originally posted by @gbowlin in #41 (comment)

We can check for the host with something like examining:

import psutil
cmds = [x for  x in psutil.Process().parent().cmdline()]

and seeing if jupyterhub, jupyter-lab, or vscode-server appear.