- `grunt webpack:dev` now copies packages JS into `/src/wp-includes/js/dist`, and CSS into `/src/wp-includes/css/dist`.
- `grunt webpack:prod` does the same, but into `/build` instead of `/src`.
- `grunt build` now runs the `webpack:prod` task.
Props atimmer, pento.
Fixes#45119.
Built from https://develop.svn.wordpress.org/branches/5.0@43760
git-svn-id: http://core.svn.wordpress.org/branches/5.0@43589 1a063a9b-81f0-0310-95a4-ce76da25c4cd
