Add Browsersync on http://localhost:3000

[colinrotherham]

We've seen frequent port :3000 conflicts whilst testing #3491 alongside other services

This PR makes a few changes:

1. Serving the review app on http://localhost:8080
2. Proxying review app using Browsersync on http://localhost:3000

Should port :3000 be unavailable we let Browsersync pick a better one

[Browsersync] Proxying: http://localhost:8080
[Browsersync] Access URLs:
 ----------------------------------
       Local: http://localhost:3000
    External: http://10.0.0.35:3000
 ----------------------------------
          UI: http://localhost:3001
 UI External: http://localhost:3001
 ----------------------------------

[domoscargin]

Looks good to me!