Docfixes

[kersulis]

Tidying up grammar and fixing a couple typos. I think I fixed the jupyter labextension installation code, but the extension itself wasn't installing correctly on my laptop.

[piever]

Thanks a lot!
Pinging @travigd to make sure the installation instruction are correct for jupyter-lab.

The failure seems unrelated (again problems with downloading gitcdn, I'll probably switch to jsdelivr soon for downloading the customized css files).

One nitpick: the tutorial notebook in doc/notebooks/tutorial.ipynb is generated from the tutorial.jl file using Literate (same as the markdown file in the docs, but that's automated in the pipeline here). Would you mind running the Literate.notebook command again to keep the notebook and the docs in sync? I unfortunately am no longer 100% sure what are the correct keyword arguments to be passed to Literate.notebook but it should be the same as here with execute=false.

[twavv]

It's just WebIO.install_jupyter_labextension() for lab (and WebIO.install_jupyter_nbextension() for classic notebook). Where did you get the link stuff from (I just want to make sure that it's not in some docs somewhere that I missed)? Please also link to the WebIO docs (https://juliagizmos.github.io/WebIO.jl/latest/providers/ijulia/) because there are a bunch of pitfalls concerning installing with JupyterLab.

Edit: oh hi Jonas