[examples/cms-contentful] Fix getStaticPaths to return proper paths

[0xroko]

Docs say that paths should return array of { params: { [slug]: path } }, but as seen in example paths is array of [ '/[slug]/[path]' ]. This isn't really a issue since fallback is set to true, but no pages will be generated at build time.

[ijjk]

Stats from current PR

Default Server Mode (Increase detected ⚠️)

General

	vercel/next.js canary	rokobekavac0/next.js canary	Change
buildDuration	12.2s	12.1s	-65ms
nodeModulesSize	91.3 MB	91.3 MB	✓

Page Load Tests Overall increase ✓

	vercel/next.js canary	rokobekavac0/next.js canary	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.231	2.231	✓
/ avg req/sec	1120.72	1120.55	⚠️ -0.17
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.272	1.226	-0.05
/error-in-render avg req/sec	1965.78	2038.64	+72.86

Client Bundles (main, webpack, commons)

	vercel/next.js canary	rokobekavac0/next.js canary	Change
677f882d2ed8..574c.js gzip	11.2 kB	11.2 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-3dd37a4..54de.js gzip	7.34 kB	7.34 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	58.3 kB	58.3 kB	✓

Client Bundles (main, webpack, commons) Modern

	vercel/next.js canary	rokobekavac0/next.js canary	Change
677f882d2ed8..dule.js gzip	7.02 kB	7.02 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
main-082aff9..dule.js gzip	6.32 kB	6.32 kB	✓
webpack-07c5..dule.js gzip	751 B	751 B	✓
Overall change	53.1 kB	53.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	rokobekavac0/next.js canary	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	rokobekavac0/next.js canary	Change
_app-9a0b9e1..b37e.js gzip	1.28 kB	1.28 kB	✓
_error-ed1b0..8fbd.js gzip	3.44 kB	3.44 kB	✓
hooks-89731c..c609.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-41ceea0..6b62.js gzip	1.35 kB	1.35 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	7.75 kB	7.75 kB	✓

Client Pages Modern

	vercel/next.js canary	rokobekavac0/next.js canary	Change
_app-75d3a82..dule.js gzip	625 B	625 B	✓
_error-4469a..dule.js gzip	2.29 kB	2.29 kB	✓
hooks-cbf13f..dule.js gzip	387 B	387 B	✓
index-b9a643..dule.js gzip	226 B	226 B	✓
link-2d41a89..dule.js gzip	1.31 kB	1.31 kB	✓
routerDirect..dule.js gzip	284 B	284 B	✓
withRouter-f..dule.js gzip	282 B	282 B	✓
Overall change	5.4 kB	5.4 kB	✓

Client Build Manifests

	vercel/next.js canary	rokobekavac0/next.js canary	Change
_buildManifest.js gzip	323 B	323 B	✓
_buildManife..dule.js gzip	329 B	329 B	✓
Overall change	652 B	652 B	✓

Rendered Page Sizes

	vercel/next.js canary	rokobekavac0/next.js canary	Change
index.html gzip	1 kB	1 kB	✓
link.html gzip	1.01 kB	1.01 kB	✓
withRouter.html gzip	994 B	994 B	✓
Overall change	3 kB	3 kB	✓

---

Serverless Mode

General

	vercel/next.js canary	rokobekavac0/next.js canary	Change
buildDuration	13.8s	14.3s	⚠️ +436ms
nodeModulesSize	91.3 MB	91.3 MB	✓

Client Bundles (main, webpack, commons)

	vercel/next.js canary	rokobekavac0/next.js canary	Change
677f882d2ed8..574c.js gzip	11.2 kB	11.2 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-3dd37a4..54de.js gzip	7.34 kB	7.34 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	58.3 kB	58.3 kB	✓

Client Bundles (main, webpack, commons) Modern

	vercel/next.js canary	rokobekavac0/next.js canary	Change
677f882d2ed8..dule.js gzip	7.02 kB	7.02 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
main-082aff9..dule.js gzip	6.32 kB	6.32 kB	✓
webpack-07c5..dule.js gzip	751 B	751 B	✓
Overall change	53.1 kB	53.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	rokobekavac0/next.js canary	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	rokobekavac0/next.js canary	Change
_app-9a0b9e1..b37e.js gzip	1.28 kB	1.28 kB	✓
_error-ed1b0..8fbd.js gzip	3.44 kB	3.44 kB	✓
hooks-89731c..c609.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-41ceea0..6b62.js gzip	1.35 kB	1.35 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	7.75 kB	7.75 kB	✓

Client Pages Modern

	vercel/next.js canary	rokobekavac0/next.js canary	Change
_app-75d3a82..dule.js gzip	625 B	625 B	✓
_error-4469a..dule.js gzip	2.29 kB	2.29 kB	✓
hooks-cbf13f..dule.js gzip	387 B	387 B	✓
index-b9a643..dule.js gzip	226 B	226 B	✓
link-2d41a89..dule.js gzip	1.31 kB	1.31 kB	✓
routerDirect..dule.js gzip	284 B	284 B	✓
withRouter-f..dule.js gzip	282 B	282 B	✓
Overall change	5.4 kB	5.4 kB	✓

Client Build Manifests

	vercel/next.js canary	rokobekavac0/next.js canary	Change
_buildManifest.js gzip	323 B	323 B	✓
_buildManife..dule.js gzip	329 B	329 B	✓
Overall change	652 B	652 B	✓

Serverless bundles

	vercel/next.js canary	rokobekavac0/next.js canary	Change
_error.js	1.06 MB	1.06 MB	✓
404.html	4.73 kB	4.73 kB	✓
hooks.html	3.92 kB	3.92 kB	✓
index.js	1.06 MB	1.06 MB	✓
link.js	1.1 MB	1.1 MB	✓
routerDirect.js	1.1 MB	1.1 MB	✓
withRouter.js	1.1 MB	1.1 MB	✓
Overall change	5.42 MB	5.42 MB	✓

Commit: 0646589

[lfades]

@rokobekavac0 Our docs are missing that explanation in this case, returning the URL has been supported since the initial implementation so the example is fine, our docs aren't clear enough here. I'm going to close the PR because our other CMS examples are using the same pattern and both ways give the same result. Thank you so much for creating the PR!