title: Vue Cli 3.0 where is the config file?
body: <p>I've seen it mentioned in docs, etc the vue.config.js file.
  And also noted previously these are handled in the webpack config file, etc in 2.0.
  But I can't find either file in my project folder created with vue cli 3.0... Where is the config files and why isn't it anywhere in the top level folders, etc?</p>