chore: add custom fern url (#6111)

Signed-off-by: Neal Vaidya <nealv@nvidia.com>

fern/docs.yml

@@ -14,7 +14,8 @@
 # limitations under the License.
 
 instances:
-  - url: dynamo.docs.buildwithfern.com
+  - url: dynamo.docs.buildwithfern.com/dynamo
+    custom-domain: docs.dynamo.nvidia.com/dynamo
 
 title: NVIDIA Dynamo Documentation
 

fern/pages/design-docs/planner-design.md

@@ -13,7 +13,7 @@ The Planner is Dynamo's autoscaling controller. It observes system metrics, pred
 
 ## Architecture
 
-![Planner architecture showing Metric Collector, Load Predictor, and Performance Interpolator feeding into the Scaling Algorithm and Connector Layer](../assets/img/planner-architecture.svg)
+![Planner architecture showing Metric Collector, Load Predictor, and Performance Interpolator feeding into the Scaling Algorithm and Connector Layer](../../assets/img/planner-architecture.svg)
 
 ## Scaling Algorithm