docs: update repo issues link in contribution guidelines

[marcos-rojas]

Closes #

✅ Checklist

• [✅] I have followed every step in the contributing guide (updated 2022-10-06).
• [✅] The PR title follows the convention we established conventional-commit
• I performed a functional test on my final commit

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_ No changelog needed

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Name	Status	Preview	Comments	Updated (UTC)
create-t3-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 3, 2023 7:56pm

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	95
🟢 Accessibility	100
🟢 Best practices	100
🟢 SEO	100
🔴 PWA	30

Lighthouse ran on https://create-t3-app-git-fork-marcos-rojas-next-t3-oss.vercel.app/

[c-ehrlich]

thanks! can't believe this went unreported for so long 😅