Introduce a broken link just to be double sure

text/3-entrees/basic-pow.md

@@ -2,6 +2,8 @@
 
 _[`nodes/basic-pow`](https://github.com/substrate-developer-hub/recipes/tree/master/nodes/basic-pow)_
 
+This is a [broken link](https://web3.foundation/research/broken)
+
 The `basic-pow` node demonstrates how to wire up a custom consensus engine into the Substrate
 Service. It uses a minimal proof of work consensus engine to reach agreement over the blockchain. It
 will teach us many useful aspects of dealing with consensus and prepare us to understand more