Demos with new compile code

[sritchie]

Note that this still depends on a local Emmy.

For a future PR:

• https://github.com/axch/dysvunctional-language/blob/master/dvl/examples/celestial/celestial-driver.scm
• mandelbrot: https://github.com/axch/dysvunctional-language/blob/master/dvl/doc/boston-slug-talk-aug-2013/mandel-driver.js
• https://github.com/nextjournal/clerk/blob/471c270f492f3d9ffa427aeaefe29a375770c8b4/notebooks/viewers/code.clj