Promote JSON Data Resource as standard (not as recipe)

[vlcinsky]

In both version of Frictionless Data documentation (v1 and v2) the JSON Data Resource is mentioned with recipes.

https://datapackage.org/recipes/json-data-resources/

To me it seems better to put this as standalone specification (despite of being rather simple).

[roll]

Definitely! Actually, it just needs to be properly articulated but technically JSON Data Resource is already supported by core Data Resource spec so there is no need in the recipe anymore