develop stand-alone geojson editor that basically does the same as geojson.io

[zguillen]

We were thinking this could be it's own react app, or a part of the landing page app, and RDM's deposit form's 'custom location' dialog would open it, passing in a callback or maybe the route with record id to save the custom geojson to.

[jugovimm]

TODO: Ask Casey if he still wants this