feat: update `/contributors` copy

[zeucapua]

Description

Updates the copy for /contributors with a new page in the Sanity CMS.

Related Tickets & Documents

Closes #235

Mobile & Desktop Screenshots/Recordings

Steps to QA

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [ ] Tier 3
• [x] Tier 4

[optional] What gif best describes this PR or how it makes you feel?

[netlify[bot]]

✅ Deploy Preview for opensauced-landing ready!

Name	Link
🔨 Latest commit	e869a4d53c1ba746f58936ff6d73307c2c11d3d1
🔍 Latest deploy log	https://app.netlify.com/sites/opensauced-landing/deploys/66450f144ed9780008b9c896
😎 Deploy Preview	https://deploy-preview-274--opensauced-landing.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 91 (no change from production) Best Practices: 92 (no change from production) SEO: 83 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.