Refactor `RevenueAndProfitChart.tsx` to use shadcn charts & remove ReactApexChart

We still use `react-apex-charts` in only one file in the template, `RevenueAndProfitChart.tsx`. Let's
- [ ] refactor to use shadcn charts
- [ ] remove the remaining apex charts CSS classes
- [ ] remove the `apexcharts` and `react-apexcharts` deps