Remove flat DNS zone image from documentation

Removed an image that illustrated a flat private DNS zone and its comparison to a sharded design.

Author: asudbring

articles/dns/sharding-private-dns-zones.md

@@ -23,8 +23,6 @@ A centralized private DNS zone might seem simpler during early adoption. However
 
 Sharding mitigates this risk by ensuring DNS changes are scoped to a clearly defined set of workloads and virtual networks. Each zone represents an ownership or operational boundary, reducing unintended impact across unrelated services.
 
-:::image type="content" source="media/sharding-private-dns-zones/dns-shard-flat-diagram.png" alt-text="Screenshot of flat private DNS zone linked to many virtual networks compared to a sharded design with zones segmented by ownership and environment." lightbox="media/sharding-private-dns-zones/dns-shard-flat-diagram.png":::
-
 > [!NOTE]
 > Sharding is an architectural pattern. Azure doesn't provide a built-in feature or toggle to enable sharding.