Update article categories to group all content under News

Adjust article categories in seed data and documentation to consolidate content under the "News" category, with plans for future subcategorization.

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replit.md

@@ -32,6 +32,9 @@ The official website for Folx Music Television (folx.tv). Dark-themed bento grid
 - New articles are inserted; articles not in seed list are deleted
 - HTML entity „/“ in title/excerpt are auto-replaced with „/" after seeding
 - Any changes to article content in seed.ts will be reflected on next deployment
+- Currently all articles are under "News" category (+ "Video" for video-only articles)
+- Future subcategory plan: add subcategory field for "Porträt" label on portrait articles
+- Portrait articles (for future subcategory): die-edlseer, die-pagger-buam, anita-hofmann, oeschs-die-dritten
 
 ## API Endpoints
 - `GET /api/articles` - All articles