Update jQuery Tutorial

[hramos]

This tutorial may need a rename, as it explains how changes to the DOM can be tested. Does "jQuery Tutorial" best capture the content of this page?

Issues:

• Missing file contents for fetchCurrentUser.js - the tutorial does not contain instructions for creating this file. (It's in the repo)

• Tests fail with Cannot find module 'jquery' from 'displayUser.js'

  • Requires npm install jquery, may be obvious as it's a jQuery tutorial that assumes jQuery is already being used.

[cpojer]

I'm happy to drop the word jquery from the Jest docs.

[cpojer]

It's 2016.

[hramos]

This tutorial has been dropped.

[github-actions]

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