docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-config-export.md

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+# filebrowser config export
+
+Export the configuration to a file
+
+## Synopsis
+
+Export the configuration to a file. The path must be for a
+json or yaml file. This exported configuration can be changed,
+and imported again with 'config import' command.
+
+```
+filebrowser config export <path> [flags]
+```
+
+## Options
+
+```
+  -h, --help   help for export
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser config](filebrowser-config.md)	 - Configuration management utility
+