schema-org

Describe the feature

I'm not 100% sure we actually get this from our data source but it would be nice having a program-accessible constant that refers to the Schema.org version that the code is currently using.

Stemming from ropensci/software-review#426, @tdjames1 mentions we might benefit from using rhandsontable's read only functionality to prevent editing of certain columns.

This would be a good improvement to the Shiny apps and maybe even a good external contribution if someone was interested in taking this on.