Set up a nightly with EasyImaging

[YooSunYoung]

There is a typical 3-d plot Odin users would see, a stack of images (normalized intensities per mixel, per wavelength).
EasyImaging will implement this as a part of the library and it'll be nice to test this in the reduction pipeline as well.
F.x. whenever we update the workflow, run this in the documentation/nightly tests.