Document that having rapidoc installed is useful

[DavisVaughan]

i.e. it is used here if installed
https://github.com/tidymodels/vetiver/blob/579a5425db2c6ad9e8668d3edcaaaea47a12086d/R/pr-predict.R#L55

it would be useful to mention in the docs for this function that having it installed does something.

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Alternatively it may be a little nicer to add a document = FALSE/TRUE argument that will only try to run that chunk of code if document = TRUE. It would fail if document = TRUE and rapidoc isn't installed. The parameter documentation for document would be a great place to mention rapidoc as well

[DavisVaughan]

This seems to have some connection to vetiver_write_plumber(docs =)

[juliasilge]

You know, I have decided it is overkill for this first release to support folks choosing any kind of visual documentation. I'm just going to import rapidoc and use it only. If folks want that as a feature, I can revisit it.

[juliasilge]

Closed in 304cfbf