Wow! Processing 4.2 adds the new pde:// protocol which allows you to open Processing sketches in the PDE directly from the browser!! We should implement this into the site for all video pages!!

See: https://github.com/processing/processing4/releases/tag/processing-1292-4.2

cc @benfry @SableRaf

Will tackle this here first, but then I can add this to the Nature of Code website as well!