De-experimentalize redirects for rosetta example (#15554)
De-experimentalize redirects for rosetta example (#15554)

Fixes #15552
JeromeFitz/next.js,zeit/next.js,zeit/next.js,JeromeFitz/next.js,azukaru/next.js,azukaru/next.js,flybayer/next.js,flybayer/next.js,flybayer/next.js,azukaru/next.js,azukaru/next.js,JeromeFitz/next.js,JeromeFitz/next.js,flybayer/next.js,zeit/next.js