fix: Remove grafna dashboard from router (#2062)

* fix: Remove grafna dashboard from router

Signed-off-by: Guangya Liu <gyliu513@gmail.com>

* Apply suggestions from code review

Co-authored-by: Abdullah Gharaibeh <40361897+ahg-g@users.noreply.github.com>
Signed-off-by: Abdullah Gharaibeh <40361897+ahg-g@users.noreply.github.com>

---------

Signed-off-by: Guangya Liu <gyliu513@gmail.com>
Signed-off-by: Abdullah Gharaibeh <40361897+ahg-g@users.noreply.github.com>
Co-authored-by: Abdullah Gharaibeh <40361897+ahg-g@users.noreply.github.com>

Author: gyliu513

DEVELOPMENT.md

@@ -11,7 +11,6 @@ Documentation for developing the llm-d Router.
   - [Kind Development Environment](#kind-development-environment)
     - [Accessing the Gateway](#accessing-the-gateway)
     - [Prometheus Monitoring](#prometheus-monitoring)
-    - [Grafana Dashboard](#grafana-dashboard)
     - [Development Cycle](#development-cycle)
     - [Debugging](#debugging)
     - [Inference Disaggregation Modes](#inference-disaggregation-modes)
@@ -170,17 +169,10 @@ Prometheus will be accessible at `http://localhost:30090`. To use a different ho
 PROM_ENABLED=true KIND_PROM_HOST_PORT=30091 make env-dev-kind
 ```
 
-### Grafana Dashboard
-
-The bundled [Inference Gateway dashboard] covers EPP metrics across the inference
-pool, inference objective, and flow control layers.
-
-Add a Prometheus datasource at `http://localhost:30090`, then import the JSON via
-**Dashboards > New > Import**. See the
-[Grafana installation docs](https://grafana.com/docs/grafana/latest/setup-grafana/installation/)
-for setup.
-
-[Inference Gateway dashboard]:deploy/grafana/inference_gateway.json
+Grafana dashboards for the llm-d Router live in the
+[llm-d monorepo](https://github.com/llm-d/llm-d/tree/main/guides/recipes/observability/grafana/dashboards).
+See [Observability Setup](https://github.com/llm-d/llm-d/blob/main/docs/operations/observability/setup.md)
+for install and import instructions.
 
 > [!NOTE]
 > For significant customization beyond the standard deployment, use the `deploy/components`