While I’m not in the target audience for this, I skimmed through the first chapter and this seems really cool - great job! I will definitely keep this one in mind if it ever becomes more relevant to me.
One small comment: the /about page only has the books listed and nothing else. Some people will probably be interested in knowing a thing or two about the author before getting the books (and there are probably a million people with the same name, so difficult to Google)
This is like wanting someone authoring a PR on github to have their about section filled out. Maybe it's nice for the reviewer to have, but some authors prefer to let the content to speak for itself. I think that's fair.
Appeal to authority is about claiming nothing in the book can be wrong on the basis it came from a respected author. It's not about treating any author as equally good to learn from as expert's just because the content could happen to also be good if you're lucky.
I wonder how that works in other fields. Is it an appeal to authority if one buys things by reading reviews? Does everyone always afford the time or the money to try each thing themselves to decide this is the one they want? Should people never look at the manufacturer brand before making a purchase?
If you know the author is an expert in a certain field, you can use that as a heuristic for deciding whether reading the entire book is worth your time.
How can the content "speak to me" when I am not familiar with a subject? If you want to learn and practice Islam, would you pick a book written by an expert Christian who prefers to denounce it?
One small comment: the /about page only has the books listed and nothing else. Some people will probably be interested in knowing a thing or two about the author before getting the books (and there are probably a million people with the same name, so difficult to Google)