move browserslist and babel config into package.json #2633
Merged
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Running webpacker:install will now add browserslist and babel configuration into package.json instead of copying files. browserslist recommends using package.json key over rc file.
Use babel.config.js in npm package as a preset, providing updates and less complexity to apps. Fixes #2532 (at least partially)
Additionally, updated rubocop.yml to target ruby 2.4 since it is now the minimum supported version