Fix broken hermes link (#349)

Author: cprussin

pages/price-feeds/how-pyth-works/cross-chain.mdx

@@ -10,7 +10,7 @@ for a feed to obtain the aggregate price and confidence. Next, the Pythnet valid
 Pythnet slot to the Wormhole contract on Pythnet containing the Merkle root of all the prices. Wormhole guardians
 then observe the Merkle root message and create a signed VAA for the Merkle root message.
 
-[Hermes](../pythnet-price-feeds/hermes) continually listens to Wormhole for Pyth Merkle roots at each slot. It also
+[Hermes](./hermes) continually listens to Wormhole for Pyth Merkle roots at each slot. It also
 listens to Pythnet to get all the price messages. It stores the latest price messages with their Merkle proof and signed
 Merkle root in memory and exposes HTTP and websocket APIs for retrieving the latest update. (Anyone can run an instance
 of this webservice, but the Pyth Data Association runs a public instance for convenience.) When a user wants to use a