adding screenshot

Author: MichaelMacaulay

website/pages/en/quick-start.mdx

@@ -109,6 +109,8 @@ Remember, deploying is not the same as publishing.
 
 2.  Authenticate and deploy your subgraph. The deploy key can be found on the subgraph's page in Subgraph Studio.
 
+![Deploy key](/img/subgraph-studio-deploy-key.jpg)
+
     ```sh
 
     graph auth --studio <DEPLOY_KEY>