Add charting that shows amount growing over time

[webinista]

• [ ] Find a charting library. SVG preferred, but -based charts are another option.
• [ ] Design the page and chart
• [ ] Implement charting

Might need to rewrite the first_million_years function to return intermediate values by month or year as well.

[webinista]

Contenders:

• https://d3js.org/
• https://recharts.org/en-US/ - Uses D3js under the hood
• https://www.chartjs.org/

More here: https://blog.logrocket.com/top-8-react-chart-libraries/