I came to say what others beat me to: this is not a periodic table, and calling it such is a legitimate disservice. It taints whatever value your content might hold because if it's presented as something that it's not, why should anyone trust it?

I strongly urge you to rename the project and most definitely update the body content of your README.md.

The best time was before you git pushed; the second best time is right now.

Agreed, I just updated it to "Elements of System Design".