add mantle sepolia and mainnet deployments

Author: MoMannn

.env.example

@@ -43,7 +43,7 @@ MONAD_RPC_URL=https://rpc.monad.xyz
 MEGA_ETH_RPC_URL=
 RONIN_RPC_URL=https://api.roninchain.com/rpc
 CELO_RPC_URL=https://rpc.celocolombia.org
-
+MANTLE_RPC_URL=https://rpc.mantle.xyz
 # Testnets
 SEPOLIA_RPC_URL=https://sepolia.infura.io/v3/${RPC_API_KEY}
 LINEA_SEPOLIA_RPC_URL=https://linea-sepolia.infura.io/v3/${RPC_API_KEY}
@@ -63,3 +63,4 @@ SONIC_TESTNET_RPC_URL=https://rpc.testnet.soniclabs.com
 HOODI_RPC_URL=https://hoodi.infura.io/v3/${RPC_API_KEY}
 RONIN_SAIGON_RPC_URL=https://saigon-testnet.roninchain.com/rpc
 CELO_SEPOLIA_RPC_URL=https://rpc.ankr.com/celo_sepolia
+MANTLE_SEPOLIA_RPC_URL=https://rpc.sepolia.mantle.xyz