fix(rss): ensure posts are sorted by date

[darbyjack]

This pull request updates the logic for generating the RSS feed to ensure posts are sorted by their publish date, improving the order of items in the feed.

Improvements to RSS feed generation:

• Added a utility function getPostDate to consistently retrieve the publish date from each post, preferring pubDate and falling back to date if necessary.
• Modified the posts retrieval logic to sort posts by publish date in descending order before mapping them to RSS items, ensuring the newest posts appear first in the feed.

Fixes #326

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	papermc-website	1124fd7	Commit Preview URL Branch Preview URL	Jul 01 2026, 11:38 AM