Update readme according to removal of nwb

Author: adsbooker

CONTRIBUTING.md

@@ -8,11 +8,13 @@
 
 ## Demo Development Server
 
-- `npm start` will run a development server with the component's demo app at [http://localhost:3000](http://localhost:3000) with hot module reloading.
+- `npm start` will run a development server with the component's demo app at [http://localhost:8080](http://localhost:8080) with hot module reloading.
 
 ## Building
 
-- `npm run build` will build the component for publishing to npm and also bundle the demo app.
+- `npm run build` will build the component for publishing to npm.
+
+- `npm run build-demo` will build the demo for publishing to github-pages.
 
 - `npm run clean` will delete built resources.