Enable extractCSS in production

• Relevant links:
  • CSS Order is different when extractCSS is used
  • CSS ordering from shared chunk not deterministic with multi entry points

It seems like our CSS is compiled differently when running Nuxt in production than it is in development. Enabling extractCSS seems to fix the issue.

About extractCSS:

Enables Common CSS Extraction using Vue Server Renderer guidelines. Using extract-css-chunks-webpack-plugin under the hood, all your CSS will be extracted into separate files, usually one per component. This allows caching your CSS and JavaScript separately and is worth a try in case you have a lot of global or shared CSS.

Closes #418 (closed)