[DO-1431] Fix PlantUML (!12)

[DO-1431]

Co-authored-by: denis.patrakeev <denis.patrakeev@avroid.tech>
Reviewed-on: https://git.avroid.tech/K8s/k8s-configs/pulls/12

clusters/k8s-avroid-office.prod.local/namespaces/plantuml/argocd-apps-plantuml-app.yaml

@@ -15,8 +15,7 @@ spec:
     - repoURL: https://git.avroid.tech/K8s/k8s-configs.git
       targetRevision: master
       ref: values
-      # https://github.com/stevehipwell/helm-charts/blob/main/charts/plantuml
-    - repoURL: https://nexus.avroid.tech/repository/avroid-charts
+    - repoURL: https://stevehipwell.github.io/helm-charts/
       chart: "plantuml"
       targetRevision: 3.36.0
       helm:
@@ -40,8 +39,7 @@ metadata:
     - resources-finalizer.argocd.argoproj.io
 spec:
   sourceRepos:
-    # https://github.com/stevehipwell/helm-charts/blob/main/charts/plantuml
-    - https://nexus.avroid.tech/repository/avroid-charts
+    - https://stevehipwell.github.io/helm-charts/
     - https://git.avroid.tech/K8s/k8s-configs.git
   # Only permit applications to deploy to the guestbook namespace in the same cluster
   destinations: