docs: fix broken links in readme

[JuroUhlar]

Fixes two broken links in readme.md reported by the link checker.

• Node LTS releases: https://nodejs.dev/en/about/releases/ -> https://nodejs.org/en/about/previous-releases (nodejs.dev is dead)
• Secret API key: https://dev.fingerprint.com/docs/quick-start-guide#4-get-smart-signals-to-your-server -> https://docs.fingerprint.com/docs/node-server-quickstart#1-get-your-secret-api-key (the old anchor no longer exists; the Node quickstart has a matching "Get your secret API key" section)

Both new URLs return 200 and the anchor exists on the rendered page. No changeset, as this is a docs-only change.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 84f9c7f

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[github-actions]

⚠️ This PR doesn't contain any changesets. If there are user-facing changes, don't forget to run:

pnpm exec changeset

to create a changeset.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	98.25%	168/171
🟢	Branches	97.03%	98/101
🟢	Functions	100%	37/37
🟢	Lines	98.21%	165/168

Test suite run success

132 tests passing in 30 suites.

Report generated by 🧪jest coverage report action from 84f9c7f

Show full coverage report

St	File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
🟢	All files	98.24	97.02	100	98.21
🟢	src	98.54	98.76	100	98.51
🔴	...edApiTypes.ts	0	0	0	0
🔴	index.ts	0	0	0	0
🟢	sealedResults.ts	100	100	100	100
🟢	...rApiClient.ts	96.15	97.22	100	96.15	360,364
🟢	types.ts	100	100	100	100
🟢	urlUtils.ts	100	100	100	100
🟢	webhook.ts	100	100	100	100
🟢	src/errors	97.05	90	100	96.96
🟢	apiErrors.ts	100	100	100	100
🟢	...orResponse.ts	100	100	100	100
🟢	toError.ts	87.5	88.88	100	87.5	21
🟢	unsealError.ts	100	50	100	100	14

[Copilot]

🟢 Approval recommended

The documentation-only changes directly replace both broken links with appropriate destinations.

0 open findings

What changed in this PR

Updates two outdated documentation links in the README.

Changes:

• Replaces the defunct Node.js releases URL.
• Links the Secret API key text to the matching Node quickstart section.

File	Description
readme.md	Fixes two broken external documentation links.

🧠 Review effort: Balanced

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