Add/remove npm package dependencies related to plotly (#8792)

CI on master is falling over after updates to plotly.

package.datascience-ui.dependencies.json

@@ -9,7 +9,6 @@
 	"@nteract/markdown",
 	"@nteract/mathjax",
 	"@nteract/octicons",
-	"@nteract/plotly",
 	"@nteract/transform-dataresource",
 	"@nteract/transform-geojson",
 	"@nteract/transform-model-debug",
@@ -130,7 +129,8 @@
 	"popper.js",
 	"parse-entities",
 	"path-browserify",
-	"polygon-offset",
+    "polygon-offset",
+    "plotly.js-dist",
 	"process",
 	"prop-types",
 	"pseudomap",