Add new quote to home page

[zkamvar]

The quote from Dr. Jones is good, but it's a bit old. I found some praise from a 2018 blog from Dr. Julie V. Hopper:

...the tutorial for the ‘poppr’ package in R, does a FANTASTIC job on guiding newbies (including my former self) through the process of how to import data into R, exploring the data, and then how to conduct some basic and advanced analyses.

Source: https://juliehopper.wordpress.com/2018/12/08/population-genetics-part-iii-data-analysis-data-wrangling-interpretation-and-implications/

I think it would be fantastic to include this on the front page of the primer.