Extend base highcharts config recursively, so base keys don't get overwritten.
Extend base highcharts config recursively, so base keys don't get overwritten.

Impactstory/impactstory-analytics,total-impact/impactstory-analytics,total-impact/impactstory-analytics,total-impact/impactstory-analytics,Impactstory/impactstory-analytics,Impactstory/impactstory-analytics,total-impact/impactstory-analytics,Impactstory/impactstory-analytics