Merge pull request #7067 from ethereum/zk-primer

Add callout to ZK page

Author: wackerow

src/content/developers/docs/scaling/zk-rollups/index.md

@@ -11,6 +11,8 @@ You should have a good understanding of all the foundational topics and a high-l
 
 Looking for a more beginner-friendly resource? See our [introduction to layer 2](/layer-2/).
 
+You should also be familiar with zero-knowledge proofs. See our [introduction to zero-knowledge proofs](/zero-knowledge-proofs/).
+
 ## Zero-knowledge rollups {#zk-rollups}
 
 **Zero-knowledge rollups (ZK-rollups)** bundle (or "roll-up") hundreds of transfers off-chain and generate a cryptographic proof. These proofs can come in the form of SNARKs (succinct non-interactive argument of knowledge) or STARKs (scalable transparent argument of knowledge). SNARKs and STARKs are known as validity proofs and get posted to layer 1.