🤖 docs: align Argo CD tutorial naming with tutorial set

Rename the Argo CD tutorial title and add an estimated duration so it aligns with the product-focused tutorial naming and format used across docs.

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Author: ThomasK33

docs/tutorials/deploy-with-argocd.md

@@ -1,4 +1,8 @@
-# Deploy coder-k8s and the CloudNativePG example with Argo CD
+# Deploy operator stack with Argo CD
+
+This tutorial deploys `coder-k8s` and the CloudNativePG-backed example stack through Argo CD.
+
+Estimated time: **20–30 minutes**.
 
 By the end, your cluster will have: