fix: Dependency upgrades, remove vulnerable serve

[chriswilty]

It's amazing how many dependencies serve brings in just to perform the basic act of serving some local files.

Coupled to that, it hasn't been updated in 6 months and has a High vulnerability dependency on path-to-regexp, so I decided to write our own simple dev server without any bells or whistles. We also use this in puppeteer tests, to host the UI.

I upgraded all other dependencies while I was at it.

[github-actions[bot]]

:tada: This PR is included in version 4.0.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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