Use jsdlivr CDN to serve code to renderer.
Use jsdlivr CDN to serve code to renderer.

The Github raw content serving issues a content type header of
`text/plain` and also instructs the browser not to sniff the actual mime
type. That breaks the `importScripts` API, so the 3D model viewer
doesn't work.

The [jsDelivr](https://www.jsdelivr.com/) CDN allows you to reference
Github sources, and it properly sets the mime type headers based on file
extension. So, use that as an intermediary to get rendering working
again.

jcoleman/ada-keyboard