I think the book is easy enough to read on Kindle. You’ll be able to grasp the concepts and see how they get implemented in Elixir. By the end of the book, you’ll have a working framework you can use to play around with to write your own Genetic Algorithms. If you don’t feel like following along by hand, you can just download the source and use the completed framework available in the final chapter!
On a side note, I think the idea of web page optimization would be really cool. The original resource I saw it in is this paper: https://core.ac.uk/download/pdf/38910449.pdf
It’s long (104 pages) and dated (from 2007), but walks you through the steps they took to implement web page evolution. I think it would be really cool to combine something like that with Phoenix Live View so a user could “evolve” a web design in real time and watch the evolution as it progresses. I’m not sure how viable/useful it would be, but it’s definitely interesting!