copy stuff in `defaultSpecConfig` to `config.ts` to prevent preview from trigger view updates
copy stuff in `defaultSpecConfig` to `config.ts` to prevent preview from trigger view updates

hack to address https://github.com/uwdata/voyager2/issues/227

uwdata/vega-lite-ui,uwdata/vega-lite-ui,vega/vega-lite-ui,uwdata/vega-lite-ui,vega/vega-lite-ui,vega/vega-lite-ui