feat: add participation and network support pages, update about fields and home winners section

- Added support for '/teilnahme' and '/netzwerk' in findSupportPages function.
- Updated the description in aboutFields to clarify the relationship with the homepage Preisträger grid.
- Enhanced the About page by integrating HomeWinnersSection for better modularity.
- Created HomeWinnersSection component to encapsulate winners display logic and improve code organization.
- Removed unused WinnerCardData type and related logic from Home component.

src/app/(frontend)/[[...slug]]/page.tsx

@@ -89,6 +89,9 @@ async function findSupportPages(payload: Awaited<ReturnType<typeof getPayload>>,
         { spaPath: { equals: '/netzwerk' } },
         { slug: { equals: 'netzwerk' } },
         { slug: { equals: 'network' } },
+        { spaPath: { equals: '/teilnahme' } },
+        { slug: { equals: 'teilnahme' } },
+        { slug: { equals: 'participation' } },
       ],
     },
   })