[nuxt] Add `postcss-preset-env` by default to nuxt
enhancement🍰 p2-nice-to-have
# [nuxt] Add `postcss-preset-env` by default to nuxt
Impossible to configure `postcss-preset-env` in Nuxt 2.16
2.xbug❗ p4-important
Deprecate external `postcss.config` for webpack
enhancement3.x🍰 p2-nice-to-have⚠️ breaking change
Nuxt not using .babelrc env settings when using npm run dev
pending triage2.x