WEB: Remove interactive terminal
- [X] closes #47530

The terminal has always been pretty slow, and probably not very useful, and it has been broken for couple of months now. Removing it, we can consider adding it back once the project is more stable.
Then jupyterlite can be removed from the dependency files? Thanks @datapythonista  Hey folks, sorry to see that was still an issue.

FYI a few performance improvements were released as part of the latest `0.1.0b16` release which should make the kernel start faster: https://github.com/jupyterlite/jupyterlite/releases/tag/v0.1.0b16

You may want to try it on this demo site first: https://jupyterlite.github.io/demo/repl/index.html?toolbar=1&kernel=python&code=import%20pandas%20as%20pd

In case you would like to reinstate the interactive terminal on the pandas docs you could then depend on `jupyterlite==0.1.0b16`.