Issue on page /docs/03-images.html

This page is looking good! We need to expand its content in the following way:

* Show an example image (from the example data) with the 5 channels separated and named. The dimensions should also be illustrated. Create this image in the Google Slides and export it as a PNG. @yhan8 Can you create this example figure?
* Add an image of how the outlines look like, and more instructions on how to obtain them. This is part of the CellProfiler segmentation pipeline, we need to clarify these instructions. I believe @rsenft1 knows more details about this?