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This video from the author is probably the best explainer: https://www.youtube.com/watch?v=WTUafAwrunE

Why don't repo READMEs have these example links when they're so readily useful for visual things?

My canvas library's README[1] has a video embedded in it. FWIW I'm not convinced it adds anything to the library's sales pitch.

[1] https://github.com/KaliedaRik/Scrawl-canvas

Agreed - much better link.

However, I "Try the editor" and then I can't find source. Clicking "GO TO SOURCE" in the properties window doesn't seem to do anything. Am I missing something?

FF and Chrome on macOS.

It looks like the source editor pane (which was in the intro video?) has gone away. It's using the code from https://motioncanvas.io/docs/quickstart.