update: cli docs, add dbt defer option (#45)

Author: jpetey75

references/lightdash-cli.mdx

@@ -582,6 +582,7 @@ These dbt flags work with Lightdash commands that support dbt options. [Read the
 - `--no-version-check`
 - `--state [state]`
 - `--full-refresh`
+- `--defer` (works with `lightdash preview` and `lightdash compile`)
 
 ### dbt project variables