Component/growing circle

This is a bubble that can grow or shrink in size. It can be placed side by side another bubble to compare % growth. It also includes the countup component, which we can keep inside or separate out and leave it up to editors to combine...

See thelma-charts/demo.html for demo.
We might need a scale instead of these calcs, because if the number is > 100, it will outgrow the container and look like a square :).