docs(api-server): remove database seeding guide card

- Removed the card for the "Understand Database Seeding" guide from the API server guides index page
- This content is likely available elsewhere in the documentation, as it's not a unique guide

Author: fulleni

src/content/docs/api-server/guides/index.mdx

@@ -24,8 +24,4 @@ This section provides practical, step-by-step guides for specific configuration
     See how to swap out the default email service with your own implementation.
     [Read more →](/docs/api-server/guides/implement-alternative-email-client/)
   </Card>
-  <Card title="Understand Database Seeding" icon="seed">
-    Learn how the server automatically populates the database with initial data.
-    [Read more &rarr;](/docs/api-server/guides/understand-database-seeding/)
-  </Card>
 </CardGrid>