docs(example): Load basic-css example on codesandbox

[gregrickaby]

Just a quick PR to add the "Try it on CodeSandbox" link at the bottom of the README.

View the example here: https://codesandbox.io/s/github/zeit/next.js/tree/canary/examples/basic-css

[ijjk]

Stats from current PR

Default Server Mode

General

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
buildDuration	11.4s	11.3s	-39ms
nodeModulesSize	53.2 MB	53.2 MB	✓

Client Bundles (main, webpack, commons)

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
main-HASH.js gzip	5.77 kB	5.77 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..8eb0.js gzip	9.78 kB	9.78 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	55.4 kB	55.4 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
main-HASH.module.js gzip	4.78 kB	4.78 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.71 kB	6.71 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	51.4 kB	51.4 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
polyfills-HASH.js gzip	26.3 kB	26.3 kB	✓
Overall change	26.3 kB	26.3 kB	✓

Client Pages

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
_app.js gzip	1.09 kB	1.09 kB	✓
_error.js gzip	2.97 kB	2.97 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	1.89 kB	1.89 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.39 kB	7.39 kB	✓

Client Pages Modern

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
_app.module.js gzip	594 B	594 B	✓
_error.module.js gzip	2.08 kB	2.08 kB	✓
hooks.module.js gzip	370 B	370 B	✓
index.module.js gzip	212 B	212 B	✓
link.module.js gzip	1.48 kB	1.48 kB	✓
routerDirect..dule.js gzip	271 B	271 B	✓
withRouter.m..dule.js gzip	270 B	270 B	✓
Overall change	5.28 kB	5.28 kB	✓

Client Build Manifests

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Rendered Page Sizes

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
index.html gzip	915 B	915 B	✓
link.html gzip	924 B	924 B	✓
withRouter.html gzip	913 B	913 B	✓
Overall change	2.75 kB	2.75 kB	✓

---

Serverless Mode (Decrease detected ✓)

General

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
buildDuration	12s	11.9s	-110ms
nodeModulesSize	53.2 MB	53.2 MB	✓

Client Bundles (main, webpack, commons)

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
main-HASH.js gzip	5.77 kB	5.77 kB	✓
webpack-HASH.js gzip	746 B	746 B	✓
de003c3a9d30..8eb0.js gzip	9.78 kB	9.78 kB	✓
framework.HASH.js gzip	39.1 kB	39.1 kB	✓
Overall change	55.4 kB	55.4 kB	✓

Client Bundles (main, webpack, commons) Modern

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
main-HASH.module.js gzip	4.78 kB	4.78 kB	✓
webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.71 kB	6.71 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
Overall change	51.4 kB	51.4 kB	✓

Legacy Client Bundles (polyfills)

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
polyfills-HASH.js gzip	26.3 kB	26.3 kB	✓
Overall change	26.3 kB	26.3 kB	✓

Client Pages

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
_app.js gzip	1.09 kB	1.09 kB	✓
_error.js gzip	2.97 kB	2.97 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	1.89 kB	1.89 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
Overall change	7.39 kB	7.39 kB	✓

Client Pages Modern

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
_app.module.js gzip	594 B	594 B	✓
_error.module.js gzip	2.08 kB	2.08 kB	✓
hooks.module.js gzip	370 B	370 B	✓
index.module.js gzip	212 B	212 B	✓
link.module.js gzip	1.48 kB	1.48 kB	✓
routerDirect..dule.js gzip	271 B	271 B	✓
withRouter.m..dule.js gzip	270 B	270 B	✓
Overall change	5.28 kB	5.28 kB	✓

Client Build Manifests

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
_buildManifest.js gzip	61 B	61 B	✓
_buildManife..dule.js gzip	61 B	61 B	✓
Overall change	122 B	122 B	✓

Serverless bundles Overall decrease ✓

	zeit/next.js canary	gregrickaby/next.js patch-1	Change
_error.js gzip	293 kB	293 kB	⚠️ +18 B
404.html gzip	1.32 kB	1.32 kB	✓
hooks.html gzip	956 B	956 B	✓
index.js gzip	293 kB	293 kB	-515 B
link.js gzip	301 kB	301 kB	⚠️ +137 B
routerDirect.js gzip	300 kB	300 kB	-281 B
withRouter.js gzip	300 kB	300 kB	-153 B
Overall change	1.49 MB	1.49 MB	-794 B

[lfades]

Nice improvement! I'm thinking where should it go, I think it may be at the beginning instead 🤔 and also I don't feel like a title is required. Or maybe under How to use inside a new title like Using Codesandbox

[lfades]

@gregrickaby @chibicode I just moved the link to be right after How to use, how does it look to you?

[gregrickaby]

I like it! Thank you!

I noticed quite a few other examples that don't have links, is that something you need taken care of?

[lfades]

@gregrickaby You can add it to examples where it makes sense to add it, meaning to examples where it would work without additional changes, not every example can do this because some require custom configs and more steps.