Include nteract web in the README (#3238)
Include nteract web in the README (#3238)


nteract/composition,nteract/nteract,nteract/nteract,rgbkrk/nteract,rgbkrk/nteract,jdfreder/nteract,jdfreder/nteract,nteract/composition,rgbkrk/nteract,jdfreder/nteract,rgbkrk/nteract,nteract/composition,nteract/nteract,jdfreder/nteract,nteract/nteract,rgbkrk/nteract,nteract/nteract