chore: update tutorial to reflect changes (#84)

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# Description

<!-- Please describe what are the changes and what they are solving for
in this PR. -->
- Updates tutorial so users make use of the `governors` address for
deploying / setting owner for base token contract as expected by the
`zk_toolbox` script:
https://github.com/matter-labs/zksync-era/pull/2973/files
- Removed the funding governor section as that is done by the script 
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## Additional context

content/tutorials/custom-zk-chain/20.customizing-your-chain.md

@@ -90,11 +90,12 @@ Next, create a `.env` file with:
 touch .env
 ```
 
-Add the `WALLET_PRIVATE_KEY` environment variable with the private key of the rich wallet we've been using
-so that we can deploy using a pre-funded address:
+Add the governor private key from our elastic_chain setup to ensure that this address becomes the owner of the token contract. Here's how
+you can add the `WALLET_PRIVATE_KEY` environment variable:
 
 ```bash
-WALLET_PRIVATE_KEY=0x7726827caac94a7f9e1b160f7ea819f172f7b6f9d2a97f992c38edeab82d4110
+# Use the private key of the `governor` from wallet.yaml
+WALLET_PRIVATE_KEY=<governor_private_key_from_wallet.yaml>
 ```
 
 ### Deploying an ERC20 Contract
@@ -223,34 +224,6 @@ For example, if we set the nominator to 20 and the denominator to 1, together th
 this would mean that 20 tokens would be given the equivalent value as 1 ETH for gas.
 For testing purposes, we'll just use a 1:1 ratio.
 
-### Funding the governor addresses
-
-Now that you have some tokens and created a new chain,
-the next step is to send some to each of the governor's addresses for the ecosystem and chain on the L1.
-This will allow you to register and deploy your chain, and deploy the paymaster.
-For the _ecosystem governor_, you can find the address in `<my_elastic_chain>/configs/wallets.yaml` under `governor`.
-
-The second governor address you need to fund is for the _chain governor_.
-The chain governor address can be found in `<my_elastic_chain>/chains/custom_zk_chain/configs/wallets.yaml` also under `governor`.
-
-Run the command below **twice** (once for each governor address) to use `cast` to transfer some of your ERC20 tokens to the governor's address on the L1.
-
-```bash
-cast send <0xYOUR_TOKEN_ADDRESS> "transfer(address,uint256)" \
-<0x_YOUR_GOVERNOR_ADDRESS> 1000000000000000000 \
---private-key 0x7726827caac94a7f9e1b160f7ea819f172f7b6f9d2a97f992c38edeab82d4110 \
---rpc-url http://localhost:8545 \
---gas-price 30000000000
-```
-
-To verify that this worked, check the balance of both governor addresses:
-
-```bash
-cast balance --erc20 <0xYOUR_TOKEN_ADDRESS> \
-<0x_YOUR_GOVERNOR_ADDRESS> \
---rpc-url http://localhost:8545
-```
-
 ### Initializing the chain
 
 ::callout{icon="i-heroicons-exclamation-triangle" color="amber"}