Document RAPIDS on NVIDIA Functions

[jacobtomlinson]

Add documentation for running RAPIDS services on https://docs.nvidia.com/cloud-functions/user-guide/latest/cloud-function/overview.html

[jameslamb]

For as long as this is in TODO / Backlog, going to remote my assignment. To keep my list of assigned-to-me issues cleaner, and to make it clearer that anyone could do this if interested.