[Alpha diversity] page specific updates

The verbiage like “compute” and “Evolutionary breadth” is very technical sounding and can be simplified. Also reduce the number of times that “compute” is used.

No one understands the chart. Can this be switched to showing histograms? Can the tools on the image be removed? Specific comments:

* “I think it is a look at US/UK over time with a possible snapshot of my data, maybe?”
* Add a title to the chart
* Both Axis need labels
* More of the paragraph needs to be spent on how to interpret the data and what it means and less on how it was derived. That can be put in the learn more section
* Not sure about the tools that pop up out of nowhere when you hover and their purpose. Make them stick and explain purpose or remove.