fix: complement CSS loader setup with pre-3.1 configuration
fix: complement CSS loader setup with pre-3.1 configuration

- Noticed that v3.0 used 'locals' package for CSS modules on
the server, which maps into `onlyLocals` option in new `css-loader`
- Fix missing `modules: { auto: true }` for production client-side
build

jaredpalmer/razzle,jaredpalmer/razzle