Added myst version of x-ray tutorial. (#49)

* Added myst version of x-ray tutorial.

* Add imageio as a dependency.

* Add comment about Gaussian and Laplacian in intro

Co-authored-by: 8bitmp3 <19637339+8bitmp3@users.noreply.github.com>

* Fix rendering of animated GIF

Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>

* Update content/tutorial-x-ray-image-processing.md

Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>

Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>
Co-authored-by: 8bitmp3 <19637339+8bitmp3@users.noreply.github.com>

Author: 3 people

README.md

@@ -20,6 +20,7 @@ or navigate to any of the documents listed below and download it individually.
 3. [Tutorial: Determining Moore's Law with real data in NumPy](content/mooreslaw-tutorial.md)
 4. [Tutorial: Saving and sharing your NumPy arrays](content/save-load-arrays.md)
 5. [Tutorial: NumPy deep learning on MNIST from scratch](content/tutorial-deep-learning-on-mnist.md)
+6. [Tutorial: X-ray image processing](content/tutorial-x-ray-image-processing.md)
 
 ## Contributing