Update namada-indexers.json

Author: Crypto-Druide

user-and-dev-tools/mainnet/namada-indexers.json

@@ -181,13 +181,6 @@
     "Discord UserName": "sirouk",
     "GitHub Account": "sirouk"
   },
-  {
-    "Which Indexer": "namada-indexer",
-    "Indexer API URL": "https://indexer-mainnet-namada.grandvalleys.com",
-    "Team or Contributor Name": "Hadesguard",
-    "Discord UserName": "hadesguard99",
-    "GitHub Account": ""
-  },
   {
     "Which Indexer": "namada-indexer",
     "Indexer API URL": "https://namada-indexer.noders.services",