This is like saying a Java library readme should start with what the JVM is. It's fine to not know these things, but the majority of this comes with the territory. Right now it sounds like you're simply not the target audience. The Github readme includes a link to all of the major bits, so I don't really see the problem.
If you were trying to convince me to build a web app in Java, you wouldn’t need to explain what the JVM is, but you’d need to make a strong argument for why Java is better than the alternatives available in 2025.
So the question is whether the target audience here is “people who want to build full-stack web apps” or “people who are already using the BHVR stack”.