Include the four tutorial notebooks using nbsphinx
Update the doc toctree so the left hand nav bar looks better and functions better, in terms of organization and how the subsection details expand when you click onto a given page.
Update the tutorial notebooks themselves.
Switch NIRCam contrasts to use F444W, for consistency with the NIRCam reduction notebook.
Update MIRI reduction notebook to use some of the enhancements and cleanup already applied to the NIRCam reductions notebook