Remove Astro templates, fix sitemap template for Next.js

- Delete: CookieConsent.astro (old Astro component)
- Delete: consent.ts, right-to-be-forgotten.ts (Astro API routes)
- Update: route.ts is now proper Next.js route handler
- Update: sitemap-template.md - replace Astro pages structure with Next.js app/ structure
- Update: payload-nextjs-notes.md - fix MongoDB port reference
- Note: seo-multi-channel auto_publish.py is for Astro sites (kept as-is)

skills/website-creator/references/payload-nextjs-notes.md

@@ -3,7 +3,7 @@
 ## PostgreSQL Connection Issues
 
 ### Wrong port
-- Docker container `astro-starter-db-1` exposes PostgreSQL on port **5555** (not 5432)
+- Docker container `payload-db-1` exposes MongoDB on port **27017** (default)
 - Fix: Use `localhost:5555` in DATABASE_URL for local development
 
 ### Wrong database name