fix: remove outdated deploy/discovery example (#7000)

Signed-off-by: Dan Gil <dagil@nvidia.com>

deploy/discovery/README.md

-<!--
-SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
-SPDX-License-Identifier: Apache-2.0
--->
-
-# Dynamo Service Discovery
-
-For documentation on Dynamo's service discovery system, see the [Service Discovery Guide](../../docs/kubernetes/service-discovery.md).

deploy/discovery/dgd.yaml

-
-# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
-# SPDX-License-Identifier: Apache-2.0
-
-apiVersion: nvidia.com/v1alpha1
-kind: DynamoGraphDeployment
-metadata:
-  name: dynamo
-  annotations:
-    nvidia.com/dynamo-discovery-backend: kubernetes
-spec:
-  envs:
-  - name: DYN_LOG
-    value: "debug"
-  services:
-    Frontend:
-      componentType: frontend
-      replicas: 1
-      extraPodSpec:
-        mainContainer:
-          image: ${IMAGE}
-    VllmDecodeWorker:
-      componentType: decode
-      replicas: 1
-      resources:
-        limits:
-          gpu: "1"
-      extraPodSpec:
-        terminationGracePeriodSeconds: 120
-        mainContainer:
-          image: ${IMAGE}
-          workingDir: /workspace/components/backends/vllm
-          command:
-          - python3
-          - -m
-          - dynamo.vllm
-          args:
-            - --model
-            - Qwen/Qwen3-0.6B
-    VllmPrefillWorker:
-      componentType: prefill
-      replicas: 1
-      resources:
-        limits:
-          gpu: "1"
-      extraPodSpec:
-        terminationGracePeriodSeconds: 120
-        mainContainer:
-          image: ${IMAGE}
-          workingDir: /workspace/components/backends/vllm
-          command:
-          - python3
-          - -m
-          - dynamo.vllm
-          args:
-            - --model
-            - Qwen/Qwen3-0.6B
-            - --disaggregation-mode
-            - prefill