Let's reorganize the stack vignette

[lwasser]

Essentially this vignette is a single overview of stack and crop_image. It's missing a clean description of stack and how stack works with the parameter options. It's also missing crop_all.

We should decide whether to have 2 vignettes - or just organize this one to show all three functions:

• [ ] crop_image
• [ ] crop_all
• [ ] stack

https://earthpy.readthedocs.io/en/latest/gallery_vignettes/plot_raster_stack_crop.html