For clarity, delete deprecated modelcard.json

We now use the README.md model card instead

Approved-by: Julien Chaumond <[email protected]>

modelcard.json

@@ -1,11 +0,0 @@
-{
-  "caveats_and_recommendations": {},
-  "ethical_considerations": {},
-  "evaluation_data": {},
-  "factors": {},
-  "intended_use": {},
-  "metrics": {},
-  "model_details": {},
-  "quantitative_analyses": {},
-  "training_data": {}
-}