fix: some broken links at collaborator guide

[mahmudhmh]

there were some broken links and fixed them in the collaborator guide @ovflowd @AugustinMauroy

[vercel]

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[AugustinMauroy]

Other point you are not obligated to ping us we are already ping with the code owner

[ovflowd]

This PR is changing links that aren't broken.

[mahmudhmh]

I've added the next-intl definition referenced with the npm link

[`next-intl`]: https://www.npmjs.com/package/next-intl

[bmuenzenmeyer]

now the remaining react-intl references should be replaced with your new next-intl reference, right?

[mahmudhmh]

now the remaining react-intl references should be replaced with your new next-intl reference, right?

no, I'm just adding the reference to the next-intl one, not the react-intl which was already working

[ovflowd]

Thanks for the first-time contribution! And for making updates to the requested changes!

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟢 90	🟢 96	🟢 100	🟢 91	🔗
/en/about	🟢 100	🟢 96	🟢 100	🟢 92	🔗
/en/about/previous-releases	🟢 100	🟢 95	🟢 100	🟢 92	🔗
/en/download	🟢 100	🟢 95	🟢 100	🟢 91	🔗
/en/blog	🟢 100	🟢 92	🟢 100	🟢 92	🔗

[ovflowd]

I'm fast-tracking this as a simple fix.

[github-actions]

Unit Test Coverage Report

Lines	Statements	Branches	Functions
	80.18% (433/540)	79.65% (137/172)	73.07% (76/104)

Unit Test Report

Tests	Skipped	Failures	Errors	Time
88	0 💤	0 ❌	0 🔥	4.71s ⏱️

[mahmudhmh]

Thanks for the first-time contribution! And for making updates to the requested changes!

Thank you sm, and sorry for the conflict at the beginning