Broken link for vecDerivs.pdf

The link for a PDF file called "vecDerivs.pdf" (which I've reference din the past on my own course website; they're great notes!) in the optimization-2.md notes is broken; see here:

https://github.com/cs231n/cs231n.github.io/blob/bd37529278dbb575e26fd2622aa0754acb832d9d/optimization-2.md?plain=1#L293C133-L293C190

Is it possible to restore this file?