update registry url, simplify installation methods

Author: ketanjani21

docs/book/src/user-guide/installation.md

@@ -4,9 +4,7 @@ Follow this guide to install the Node Readiness Controller in your Kubernetes cl
 
 ## Deployment Options
 
-### Option 1: Install Official Release (Recommended)
-
-The easiest way to get started is by applying the official release manifests.
+### Install Official Release
 
 First, to install the CRDs, apply the `crds.yaml` manifest:
 
@@ -34,41 +32,14 @@ If it gets evicted during resource pressure, nodes can't transition to Ready sta
 
 This is the priority class used by other critical cluster components (eg: core-dns).
 
-**Images**: The official releases use multi-arch images (AMD64, Arm64) available in the Kubernetes staging registry:
+**Images**: The official releases use multi-arch images (AMD64, Arm64).
 
 ```sh
-REPO="us-central1-docker.pkg.dev/k8s-staging-images/node-readiness-controller/node-readiness-controller"
-TAG=$(skopeo list-tags docker://$REPO | jq .Tags[-1] | tr -d '"')
+REPO="registry.k8s.io/node-readiness-controller/node-readiness-reporter"
+TAG=$(skopeo list-tags docker://$REPO | jq .'Tags[-1]' | tr -d '"')
 docker pull $REPO:$TAG
 ```
 
-### Option 2: Deploy Using Make Commands
-
-**Build and push your image to the location specified by `IMG_PREFIX`:`IMG_TAG` :**
-
-```sh
-# Build and push your image
-make docker-build docker-push IMG_PREFIX=<some-registry>/nrr-controller IMG_TAG=tag
-
-# Install the CRDs
-make install
-
-# Deploy the controller
-make deploy IMG_PREFIX=<some-registry>/nrr-controller IMG_TAG=tag
-```
-
-### Option 3: Deploy Using Kustomize
-
-If you have cloned the repository and want to deploy from source, you can use Kustomize.
-
-```sh
-# 1. Install Custom Resource Definitions (CRDs)
-kubectl apply -k config/crd
-
-# 2. Deploy Controller and RBAC
-kubectl apply -k config/default
-```
-
 ## Verification
 
 After installation, verify that the controller is running successfully.