Use jsdelivr for CDN

[thewtex]

https://www.jsdelivr.com/

Appears to be more production-oriented than Unpkg

[thewtex]

Local testing works, need to update doc's.

[thewtex]

@PaulHax with #485 does the CDN bundle still work? Can it be updated to use jsdelivr?

[PaulHax]

#485 does not change the publicPath for the itkVtkViewerCDN.js webpack target... But how to mock a jsdeliver setup for that branch?

You already setup webpack to use jsdeliver methinks...

[thewtex]

You already setup webpack to use jsdeliver methinks...

Hmm, it seems so. 🙄 Good job past me :-).

I see we have __itk_version__:

itk-vtk-viewer/src/itkConfigCDN.js

Lines 7 to 8 in 8084f37

	imageIOUrl: __webpack_public_path__ + 'itk-image-io@' + __itk_version__, // eslint-disable-line no-undef
	meshIOUrl: __webpack_public_path__ + 'itk-mesh-io@' + __itk_version__, // eslint-disable-line no-undef

But in recent itk-wasm, we are decoupling the itk-*-io package version from the main itk-wasm package. So, I will keep this issue open for now.