I'd actually love that material in C++/CUDA.
Perhaps Cling can do something, or not, but I guess that's up to people who prefer Cling to find out and utilize.
* Always have the call to action repeated at the bottom of the page; you did a great job having it above the fold, but I got to the end and had to scroll back up to express intent. That's a flowbreaking design.
* This is purely stylistic, but I strongly prefer the first letter of each line to be capitalized. I find the stylistic inconsistency around capitalization offputting.
* You have pretty nicely made docs, consider making the link to view the sample chapters a clickable picture of the first diagram-page in your chapter.
Thanks for making this!