docs: 'uc docs' command to generate CLI reference docs

website/docs/9-cli-reference/uc_caddy.md

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+# uc caddy
+
+Manage Caddy reverse proxy service.
+
+## Options
+
+```
+  -h, --help   help for caddy
+```
+
+## Options inherited from parent commands
+
+```
+      --connect string          Connect to a remote cluster machine without using the Uncloud configuration file.
+                                Format: [ssh://]user@host[:port] or tcp://host:port
+      --uncloud-config string   Path to the Uncloud configuration file. (default "~/.config/uncloud/config.yaml")
+```
+
+## See also
+
+* [uc](uc.md)	 - A CLI tool for managing Uncloud resources such as clusters, machines, and services.
+* [uc caddy config](uc_caddy_config.md)	 - Show the current Caddy configuration (Caddyfile).
+* [uc caddy deploy](uc_caddy_deploy.md)	 - Deploy or upgrade Caddy reverse proxy across all machines in the cluster.
+