docs: fix contract verification url (#142)

# Description
The urls referenced for contract verification are incorrect. This fixes
them with the zk parser tag that has the correct URL defined for both
testnet and mainnet. These were added in
matter-labs/docs-nuxt-template#56

## Linked Issues

Resolves #135

Author: itsacoyote

content/00.build/40.tooling/20.hardhat/80.hardhat-zksync-verify.md

@@ -70,7 +70,7 @@ networks: {
       ethNetwork: "%%zk_testnet_identifier%%", // The Ethereum Web3 RPC URL, or the identifier of the network (e.g. `mainnet` or `sepolia`)
       zksync: true,
       // Verification endpoint for Sepolia
-      verifyURL: '%%zk_testnet_block_explorer_url%%/contract_verification'
+      verifyURL: '%%zk_testnet_contract_verification_url%%'
     }
 },
 // defaultNetwork: "zkTestnet", // optional (if not set, use '--network zkTestnet')
@@ -91,8 +91,8 @@ If you want to run a `hardhat-verify` verification, this field needs to be set t
 If set to `true`, the verification process will try to run the verification process on the ZKsync Era network.
 - `verifyURL` is a field that points to the verification endpoint for the specific ZKsync network.
 This parameter is optional, and its default value is the testnet verification url.
-  - Testnet: `%%zk_testnet_block_explorer_url%%/contract_verification`
-  - Mainnet: `%%zk_mainnet_block_explorer_url%%/contract_verification`
+  - Testnet: `%%zk_testnet_contract_verification_url%%`
+  - Mainnet: `%%zk_mainnet_contract_verification_url%%`
 
 If you want to verify a smart contract on the Ethereum in the same project,
 it is important to add `etherscan` field and API key in the `hardhat.config.ts` file:

content/00.build/40.tooling/20.hardhat/90.hardhat-zksync-verify-vyper.md

@@ -81,7 +81,7 @@ networks: {
       ethNetwork: "%%zk_testnet_identifier%%", // The Ethereum Web3 RPC URL, or the identifier of the network (e.g. `mainnet` or `sepolia`)
       zksync: true,
       // Verification endpoint for Sepolia
-      verifyURL: '%%zk_testnet_block_explorer_url%%/contract_verification'
+      verifyURL: '%%zk_testnet_contract_verification_url%%'
     }
 },
 // defaultNetwork: "zkTestnet", // optional (if not set, use '--network zkTestnet')
@@ -100,8 +100,8 @@ This field is set to `true` for all ZKsync Era networks. Field value `true` is r
 If field is missing or if values is set to `false` plugin will throw a error.
 - `verifyURL` is a field that points to the verification endpoint for the specific ZKsync network.
 This parameter is optional, and its default value is the testnet verification url.
-  - Testnet: `%%zk_testnet_block_explorer_url%%/contract_verification`
-  - Mainnet: `%%zk_mainnet_block_explorer_url%%/contract_verification`
+  - Testnet: `%%zk_testnet_contract_verification_url%%`
+  - Mainnet: `%%zk_mainnet_contract_verification_url%%`
 
 ### Commands