text: Title: [DOCS] Multi-gpu demo
  Body: Demo of multi-GPU with RAPIDS.ai + Graphistry
  
  - [ ] embeddable in Graphistry getting started dashboard: smart defaults listed
  - [ ] show both out-of-core + multi-gpu
  - [ ] encapsulated: no need to register etc. to get data
  - [ ] tech: dask_cudf, bsql, & cuGraph. OK if split into multiple notebooks
  - [ ] ultimately: x-post w/ rapids+blazing repos?
  
  The taxi dataset is interesting. Maybe run that -> UMAP / k-nn -> viz?
  
  Or maybe something better that is open access and more inherently graph-y, like app logs?
  