chore: remove deprecated env variable and update endpoint

Author: eccentricexit

.env.example

@@ -2,7 +2,7 @@ FACTORY_ADDRESS=0x4296b39059b8591d4f22a0fc4ee49508279b8fc6
 BATCH_WITHDRAW_ADDRESS=0xA32942798112e561d4d3ffc62c552bb0E9651b66
 PROVIDER_URL=https://kovan.infura.io/v3/<secret-key>
 #LBATCH_WITHDRAW_ADDRESS=0x8Fa00b7281cD8296bB3818AE5654B4FCCe9a3f2F
-#GTCR_SUBGRAPH_URL=https://api.thegraph.com/subgraphs/name/eccentricexit/light-curate-kovan-iii
+#GTCR_SUBGRAPH_URL=https://api.thegraph.com/subgraphs/name/eccentricexit/light-curate-kovan-ii
 
 # How often to check if items passed the challenge period without challenges.
 # The minimum value accepted is  2 * BLOCK_TIME_SECONDS / 60.
@@ -17,7 +17,6 @@ BLOCK_TIME_SECONDS=4
 # sweeping the blockchain from the deployment block of the factory contract.
 # This field is optional, if not set, 0 will be used.
 FACTORY_BLOCK_NUM=18495615
-#LFACTORY_BLOCK_NUM=27204506
 
 # This is the account that will call execute unchallenged requests
 # and withdraw rewards for the users.