I am running Web AppBuilder-Developer's Edition on my local and I want to be able to build a custom Web AppBuilder app, download the code (and modify/customize it), and then serve it from an PaaS like Heroku. ALthough I know that Web AppBuilder Apps are based on a NodeJS framework, when I downloaded the files/code for my app, I noticed that it doesn't have quite the same file structure as a NodeJS application (Ex: the package.json file is in the libs folder). Also, there is no Web Server component like Express that would typically be used with NodeJS. Has anyone tried launching a standalone version of a Web AppBuilder app from a PaaS? I know it can be done using .Net/IIS, but I don't want to go that route.