Create training notebooks

[rgbkrk]

People seem to enjoy our example notebooks (they also make demoing easy!). I'd like for us to have some organized sections specific to each language and a basic intro notebook:

• [ ] Welcome to nteract!
• [ ] Python
  • [x] Pandas to GeoJSON
  • [ ] Integrating your objects with IPython
  • [x] Updating Displays by Name
• [ ] JavaScript
  • [x] Custom revivers for JSON.parse
  • [ ] Integrating your objects with IJavaScript
• [ ] R
  • [ ] Using ggplot
  • [ ] Distributing Analysis with Sparklyr
  • [ ] Integrating your objects (?) with IRkernel
  • [ ] Yes, it's the iris data set again

In the long run we might have a better indexed grouping of content - for now we have a hierarchical menu that we can curate.