Update cheatsheets

argocd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# argocd
+
+> Command-line interface to control a Argo CD server.
+> Some subcommands such as `argocd app` have their own usage documentation.
+> More information: <https://argo-cd.readthedocs.io/en/stable/user-guide/commands/argocd/>.
+
+- Login to Argo CD server:
+
+`argocd login --insecure --username {{user}} --password {{password}} {{argocd_server:port}}`
+
+- List applications:
+
+`argocd app list`