delete the metadata reducer setup for nbextension (#2142)
delete the metadata reducer setup for nbextension (#2142)


rgbkrk/nteract,rgbkrk/nteract,rgbkrk/nteract,jdfreder/nteract,captainsafia/nteract,nteract/composition,jdetle/nteract,rgbkrk/nteract,jdetle/nteract,nteract/nteract,nteract/nteract,jdfreder/nteract,nteract/composition,captainsafia/nteract,nteract/nteract,jdfreder/nteract,nteract/composition,jdetle/nteract,nteract/nteract,nteract/nteract,captainsafia/nteract,jdfreder/nteract,rgbkrk/nteract,captainsafia/nteract,jdetle/nteract