Migrates jquery-ui to npm package

jquery-ui has been updated in the regristry to point to npm:jquery-ui
instead of github:components/jqueryui.

Further, package-overrides that pointed at the github:components version
of both jquery-ui and jquery have been updated to rely on the npm version
of the package.

Fixes #1008

package-overrides/github/timdream/wordcloud2.js@master.json

@@ -3,6 +3,6 @@
     "lib": "src"
   },
   "shim": {
-    "wordcloud2.js": "github:components/jquery"
+    "wordcloud2.js": "npm:jquery"
   }
 }