Update RSS LinkCard descriptions

[derekblank]

Description

• Adds short descriptions to RSS LinkCards (https://v2.tauri.app/rss/)
• Closes tauri-apps/tauri-docs#2173

Open to suggestions on the actual descriptions, but these seemed reasonable as a starter:

All updates Get notified about any updates across the entire site.

Blog updates Stay up-to-date with the latest blog posts and articles.

Pages updates Receive updates for the main website pages.

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