CHORE(docusaurus): migrate from GHCR to Zot registry

- Change image registry to zot0213.kro.kr
- Add imagePullSecrets for Zot authentication
- Update ArgoCD Image Updater annotations for Zot

docusaurus/helm-values.yaml

@@ -3,11 +3,14 @@
 name: docusaurus
 
 image:
-  registry: ghcr.io
-  repository: mayne0213/docusaurus
+  registry: zot0213.kro.kr
+  repository: docusaurus
   tag: latest  # Updated by ArgoCD Image Updater
   pullPolicy: Always
 
+imagePullSecrets:
+  - name: zot-secret
+
 replicaCount: 2
 containerPort: 80  # nginx