…lation (#2276)

The very rough outline is intact, including the code, but I still need
to write/revise some prose between the cells. Right now this example
uses the `mergedeep` package to merge the user's estimator options with
the function's default. If we need to remove this dependency, then I
will modify the program so that if a user passes estimator options, they
completely replace the function's default.

Closes #2242.

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Co-authored-by: Jen Glick <[email protected]>
Co-authored-by: Rebecca Dimock <[email protected]>
Co-authored-by: Rebecca Dimock <[email protected]>

I am not able to push directly to the branch in #2300, so I opened this
instead.