feat: add RSS feed for the changelog

[zeucapua]

Description

Implements RSS for changelogs.

What type of PR is this? (check all applicable)

• [X] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

Related Tickets & Documents

Closes #194

Mobile & Desktop Screenshots/Recordings

Steps to QA

1. Visit https://deploy-preview-199--opensauced-landing.netlify.app/api/rss/changelog

Added to documentation?

• [ ] 📜 README.md
• [ ] 📓 docs.opensauced.pizza
• [ ] 🍕 dev.to/opensauced
• [ ] 📕 storybook
• [X] 🙅 no documentation needed

[optional] Are there any post-deployment tasks we need to perform?

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

[netlify[bot]]

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Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 91 (no change from production) Best Practices: 92 (no change from production) SEO: 82 (no change from production) PWA: - View the detailed breakdown and full score reports

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