Set separate entry file when using custom server
I'm rendering through my own http server like in the examples and I get an error that I didn't export a router.  My Node entry in package.json is server.js.  My layout from create-ream-app is /src/router/index.js but the default in the newer docs looks for it in /index.js.  I'm confused if I should using a src/ style directory layout and if server.js should be at the root or in src.  Setting the entry in ream.config has no effect.