Reverts the index action to yield the code_schools.yml file
Reverts the index action to yield the code_schools.yml file

The API contract between the front and backend is broken.

The backend changed the JSON structure, and the frontend did not.

This reverts back to the former JSON shape, for the time being.

OperationCode/operationcode_backend,OperationCode/operationcode_backend,OperationCode/operationcode_backend