docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-cmds-add.md

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+# filebrowser cmds add
+
+Add a command to run on a specific event
+
+## Synopsis
+
+Add a command to run on a specific event.
+
+```
+filebrowser cmds add <event> <command> [flags]
+```
+
+## Options
+
+```
+  -h, --help   help for add
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser cmds](filebrowser-cmds.md)	 - Command runner management utility
+