Getting images in a jupyter widget without failing tests

[sebranchett]

This is related to issue #36.

The problem it solves is:
Jupyter Notebook widget needs images to be in lined (no references).
esbuild does this if you use the syntax:
import myimg from './assets/myimg.png';
mocha testing however will not accept this syntax .

This is a very hacky fix, that replaces GetImage.js with the
URL(imagePath, import.meta.url).href;
syntax before testing and restoring the ‘import’ syntax after testing.

Works for:

1. widget
2. stand-alone
3. testing

The Copilot generated solution to issue #36 is more elegant, very complicated and I’m not convinced it will solve the problem addressed here.

I suggest we go with this hacky solution until we can come up with a better idea, that works for all 3 cases.