Update social links for Christoph Berg

Author: Andreas Scherbaum

postgresfriends.json

@@ -346,7 +346,6 @@
 	},
 	"Christoph Berg": {
 		"interview": "christoph_berg",
-		"Twitter": ["https://twitter.com/df7cb"],
 		"Mastodon": ["https://mastodon.social/@df7cb"]
 	},
 	"Josh Berkus": {