Add disk monitoring

[iandesj]

This is continuation of what #232 is trying to enhance!

Additionally, this PR:

• Fixes computing the disk warning state
• Propagates all resources in warning, not just memory
• Tweaks the react condition to look at all warnings

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[iandesj]

@krassowski Would you be able to add the correct label(s)?

[iandesj]

@krassowski (and other contrib's) what would help get this across the line?

[iandesj]

My project has been using these changes in production for nearly a month now.

[krassowski]

Just a small suggestions/questions, a few typos in the documentation to fix, otherwise it looks good to me.

[iandesj]

@krassowski I've made those suggested changes

[krassowski]

Thank you @iandesj!

[krassowski]

@iandesj, @perllaghu - this is now released with https://github.com/jupyter-server/jupyter-resource-usage/releases/tag/v1.1.0 available on PyPI now and some time later on conda-forge 🎉

[perllaghu]

Excellent - many thanks.