[Anki Cards] Reference Url all broken

Created by: minostro

The reference urls used in the Anki cards are all broken because they point to a non-existing/deleted(?) repo. e.g.: https://github.com/donnemartin/system-design-primer-interview#document-store

The fix is easy. We just need to change system-design-primer-interview for system-design-primer.

I have the time to make the changes. However, I am not sure how to export the apkg file with my changes.