Update quick-start.mdx

Author: freddmannen

docs/flashbots-auction/quick-start.mdx

@@ -14,7 +14,6 @@ See you on-chain! ⚡🤖
 | Network | URL                                   |
 | ------- | ------------------------------------- |
 | Mainnet | `https://relay.flashbots.net`         |
-| Goerli  | `https://relay-goerli.flashbots.net`  |
 | Sepolia | `https://relay-sepolia.flashbots.net` |
 
 ### Who should use Flashbots Auction?