Move config files outside of src

[5arias]

There's no hard rule against placing configuration files inside the src folder however it's a common/best practice to keep development configuration code elsewhere in your directory structure. If you ever eject your app, you'll find that a config directory is created at the project root containing files for jest and webpack.

https://github.com/mikedolan03/myhealthtarget/blob/master/src/config.js
https://github.com/mikedolan03/myhealthtarget/blob/master/src/setupTests.js