fix doc links

Author: Krayt78

content/1-Cryptography/materials/zk-factorization-example/circuit_example_playground/snarkjs_README.md

@@ -505,7 +505,7 @@ If all is well, you should see that `OK` has been outputted to your console. Thi
 snarkjs zkey export solidityverifier circuit_final.zkey verifier.sol
 ```
 
-Finally, we export the verifier as a Solidity smart-contract so that we can publish it on-chain -- using [remix](https://remix.ethereum.org/) for example. For the details on how to do this, refer to section 4 of [this tutorial](https://blog.iden3.io/first-zk-proof.html).
+Finally, we export the verifier as a Solidity smart-contract so that we can publish it on-chain -- using [remix](https://remix.ethereum.org/) for example.
 
 ### 26. Simulate a verification call
 

content/6-Protocol_On-Chain/Zombienet-slides.md

@@ -784,7 +784,7 @@ network.add_node("new1", opts).await?;
 ```
 
 ---v
-Example: [Add a new parachain](https://paritytech.github.io/zombienet-sdk/zombienet_orchestrator/network/struct.Network.html#method.add_parachain) to a running network
+Example: Add a new parachain to a running network
 
 ```rust [1-7|9]
 let para_config = network