Group CSS files in shared build output separate from JS files (#11184)
Group CSS files in shared build output separate from JS files (#11184)

* Group CSS files in shared build output separate from JS files

* Fix buildId not being replaced in shared by all
azukaru/next.js,azukaru/next.js,flybayer/next.js,flybayer/next.js,JeromeFitz/next.js,JeromeFitz/next.js,azukaru/next.js,zeit/next.js,azukaru/next.js,JeromeFitz/next.js,JeromeFitz/next.js,zeit/next.js,flybayer/next.js,zeit/next.js,flybayer/next.js