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/allpro/layout@1.4.3.json

@@ -5,8 +5,8 @@
         "lib": "source/stable"
     },
     "dependencies": {
-        "jquery": "github:components/jquery",
-        "jquery-ui": "github:components/jqueryui"
+        "jquery": "npm:jquery",
+        "jquery-ui": "npm:jquery-ui"
     },
     "shim": {
         "jquery-ui-layout": {