[DOC] images for models in examples

[mathematicalmichael]

the links in the README pull up HTML pages that seem to be missing images for the models.

Perhaps I could convert them to markdown/latex cells so they'll guarantee rendering?

Love this repo, by the way. Writing a software library (and demos for it) based on my thesis work in inverse problems, and this helps motivate what "good tutorials" can look like.

[ericmjl]

Thank you @mathematicalmichael! Yes, I would love to accept a PR that improves the "documentation" story for this repo. Please go ahead, and don't forget to reference this issue!