Add an experimental mode for flyingShuttle

[Timer]

This PR adds a new experimental setting called flyingShuttle.

All pages will be built in a standalone mode when flyingShuttle is enabled.

[github-actions]

Stats from current PR

Click to expand stats

	zeit/next.js canary	Timer/next.js flying-shuttle	Change
Build Duration	12.4s	12.4s	-31ms
node_modules Size	44 MB	44 MB	⚠️ +167 B
Total Bundle (main, webpack, commons) Size	202 kB	202 kB	✓
Total Bundle (main, webpack, commons) gzip Size	66 kB	66 kB	✓
Client _app Size	2.49 kB	2.49 kB	✓
Client _app gzip Size	1.04 kB	1.04 kB	✓
Client _error Size	8.85 kB	8.85 kB	✓
Client _error gzip Size	3.31 kB	3.31 kB	✓
Client pages/index Size	298 B	298 B	✓
Client pages/index gzip Size	235 B	235 B	✓
Client pages/link Size	3.28 kB	3.28 kB	✓
Client pages/link gzip Size	1.49 kB	1.49 kB	✓
Client pages/routerDirect Size	426 B	426 B	✓
Client pages/routerDirect gzip Size	304 B	304 B	✓
Client pages/withRouter Size	408 B	408 B	✓
Client pages/withRouter gzip Size	293 B	293 B	✓
Client main Size	24.4 kB	24.4 kB	✓
Client main gzip Size	7.89 kB	7.89 kB	✓
Client commons Size	175 kB	175 kB	✓
Client commons gzip Size	56.8 kB	56.8 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	774 B	774 B	✓
Base Rendered Size	1.34 kB	1.34 kB	✓
Build Dir Size	340 kB	340 kB	✓

Click to expand serverless stats

	zeit/next.js canary	Timer/next.js flying-shuttle	Change
Build Duration	13.8s	13.8s	-36ms
node_modules Size	44 MB	44 MB	⚠️ +167 B
Total Bundle (main, webpack, commons) Size	202 kB	202 kB	✓
Total Bundle (main, webpack, commons) gzip Size	66 kB	66 kB	✓
Client _app Size	2.49 kB	2.49 kB	✓
Client _app gzip Size	1.04 kB	1.04 kB	✓
Client _error Size	8.85 kB	8.85 kB	✓
Client _error gzip Size	3.31 kB	3.31 kB	✓
Client pages/index Size	298 B	298 B	✓
Client pages/index gzip Size	235 B	235 B	✓
Client pages/link Size	3.28 kB	3.28 kB	✓
Client pages/link gzip Size	1.49 kB	1.49 kB	✓
Client pages/routerDirect Size	426 B	426 B	✓
Client pages/routerDirect gzip Size	304 B	304 B	✓
Client pages/withRouter Size	408 B	408 B	✓
Client pages/withRouter gzip Size	293 B	293 B	✓
Client main Size	24.4 kB	24.4 kB	✓
Client main gzip Size	7.89 kB	7.89 kB	✓
Client commons Size	175 kB	175 kB	✓
Client commons gzip Size	56.8 kB	56.8 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	774 B	774 B	✓
Serverless pages/link Size	308 kB	308 kB	✓
Serverless pages/link gzip Size	79.3 kB	79.3 kB	-2 B
Serverless pages/index Size	300 kB	300 kB	✓
Serverless pages/index gzip Size	77.4 kB	77.4 kB	-2 B
Serverless pages/_error Size	301 kB	301 kB	✓
Serverless pages/_error gzip Size	77.2 kB	77.2 kB	-1 B
Serverless pages/routerDirect Size	301 kB	301 kB	✓
Serverless pages/routerDirect gzip Size	77.5 kB	77.5 kB	-2 B
Serverless pages/withRouter Size	301 kB	301 kB	✓
Serverless pages/withRouter gzip Size	77.6 kB	77.6 kB	-1 B
Build Dir Size	1.73 MB	1.73 MB	✓