[DOC] Examples are not in docs

[brycelelbach]

I went to the main documentation page and was surprised to find no mention of examples. Please include examples in the documentation, including at least one "hello world" on the landing page (and in the repos README).

[grlee77]

Agree that this definitely needs improvement.

The scikit-image examples gallery is currently the best way to reference the API usage for the image processing functions under cucim.skimage: https://scikit-image.org/docs/stable/auto_examples/index.html

We can potentially copy over a decent number of scikit-image examples which currently can be run on GPU via cuCIM. Those examples tend to use very small data (e.g. 512x512 images), though, so they are good for learning the API, but not for illustrating the performance benefits of cuCIM.

[grlee77]

For Image I/O functionality, there are small number of notebooks in the repository, but we don't currently render these in the docs.