Updates the mainnet typescript deploy config to re-export json

to de-duplicate hard-coded values, allow for backwards typescript
compatibility, and maintain the use of comments.

packages/contracts-bedrock/deploy-config/mainnet.ts

 import { DeployConfig } from '../src/deploy-config'
+import mainnetJson from './mainnet.json'
 
 // NOTE: The 'mainnet' network is currently being used for bedrock migration rehearsals.
 // The system configured below is not yet live on mainnet, and many of the addresses used are
 // unsafe for a production system.
 
-// The following addresses are assigned to multiples roles in the system, therfore we save them
-// as constants to avoid having to change them in multiple places.
-const foundationMultisig = '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266' // hh test signer 0
-const feeRecipient = '0x70997970C51812dc3A010C7d01b50e0d17dc79C8' // hh test signer 1
-const mintManager = '0x5C4e7Ba1E219E47948e6e3F55019A647bA501005'
-
-const config: DeployConfig = {
-  finalSystemOwner: foundationMultisig,
-  controller: foundationMultisig,
-  portalGuardian: foundationMultisig,
-  proxyAdminOwner: foundationMultisig,
-
-  l1StartingBlockTag:
-    '0x126e52a0cc0ae18948f567ee9443f4a8f0db67c437706e35baee424eb314a0d0',
-  l1ChainID: 1,
-  l2ChainID: 10,
-  l2BlockTime: 2,
-
-  maxSequencerDrift: 600,
-  sequencerWindowSize: 3600,
-  channelTimeout: 300,
-
-  p2pSequencerAddress: '0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65',
-  batchInboxAddress: '0xff00000000000000000000000000000000000010',
-  batchSenderAddress: '0x70997970C51812dc3A010C7d01b50e0d17dc79C8',
-  l2OutputOracleSubmissionInterval: 20,
-  l2OutputOracleStartingTimestamp: 1679069195,
-  l2OutputOracleStartingBlockNumber: 79149704,
-  l2OutputOracleProposer: '0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC',
-  l2OutputOracleChallenger: foundationMultisig,
-  finalizationPeriodSeconds: 2,
-
-  baseFeeVaultRecipient: feeRecipient,
-  l1FeeVaultRecipient: feeRecipient,
-  sequencerFeeVaultRecipient: feeRecipient,
-
-  governanceTokenName: 'Optimism',
-  governanceTokenSymbol: 'OP',
-  governanceTokenOwner: mintManager,
-
-  l2GenesisBlockGasLimit: '0x1c9c380',
-  l2GenesisBlockCoinbase: '0x4200000000000000000000000000000000000011',
-  l2GenesisBlockBaseFeePerGas: '0x3b9aca00',
-
-  gasPriceOracleOverhead: 2100,
-  gasPriceOracleScalar: 1000000,
-  eip1559Denominator: 50,
-  eip1559Elasticity: 10,
-
-  l2GenesisRegolithTimeOffset: '0x0',
-}
+// Re-export the mainnet json as a DeployConfig object.
+//
+// Notice, the following roles in the system are assigned to the:
+// Optimism Foundation Mulitisig:
+// - finalSystemOwner
+// - controller
+// - portalGuardian
+// - proxyAdminOwner
+// - l2OutputOracleChallenger
+//
+// The following roles are assigned to the same fee recipient:
+// - baseFeeVaultRecipient
+// - l1FeeVaultRecipient
+// - sequencerFeeVaultRecipient
+//
+// The following role is assigned to the Mint Manager contract:
+// - governanceTokenOwner
+const config: DeployConfig = mainnetJson
 
 export default config