Upgrade current project to new React/Redux JavascriptServices template

[thangchung]

https://github.com/aspnet/templating/blob/dev/src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/ReactRedux-CSharp/Startup.cs

[thangchung]

TODO: add another client for prod, server-dev (:5000) and client-dev (:3000) clients so that we don't need to switch the configs

• Add key in Spa config section in the server. If in the server render then enable flag to true
• In the configs file (client), we check this flags and use to correct one client to run