doc: Add docs on delta deploy steps

doc/deploy_delta.md

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+# Livepeer Delta upgrade deployment steps
+
+## Step 1: Deploy contracts
+
+Run the deployment script to deploy the new contracts:
+
+```
+npx hardhat deploy --tags DELTA_UPGRADE --network arbitrumMainnet
+```
+
+You must configure the private key for an account that has enough ETH to run the transactions.
+
+## Step 2: Prepare governance update
+
+1.  Grab the full git hash from the current repository where you ran the deployment script, or get it from the output of
+    the pending governance actions.
+2.  Also obtain the addresses of the contracts deployed above. You can find them in the corresponding `deployments` directory or
+    in the output of the deployment script.
+3.  Now on the `governance-scripts` repository, update:
+    a) the `0xPENDING_ADDRESS` address entries on the `updates/addresses.js` file with the deployed contracts.
+    b) the `0xPENDING_GIT_HASH` references in `updates/l2-lip-delta-91-92.js` with the git hash from the protocol
+    repository.
+
+## Step 3: Run governance update
+
+In the `governance-scripts` repository, run the governance update script:
+
+```
+node index.js create ./updates/l2-lip-delta-91-92.js 0
+```
+
+This will print out the transaction that should be run by the governor owner to stage the update
+on the governance contract.
+
+This should now be provided to the wallet interface to stage and then execute the governance update.
+
+## Step 4: Validate the update
+
+You can run the task at
+[https://github.com/livepeer/protocol/blob/vg/fork-test-2/tasks/verify-delta-deployment.ts](verify-delta-deployment.ts)
+to verify the deployment and governance update.
+
+To do so, copy that task to your local task folder and then run:
+
+```
+npx hardhat verify-delta-deployment --network arbitrumMainnet
+```
+
+## Step 5: Renounce deployer admin role
+
+Once the governance update has been executed and the update validated (e.g. wait for next round and some treasury
+contributions to take place as expected), the deployer admin role should be renounced.
+
+To do so, run the following command with the same account with which you ran the deploy:
+
+```
+npx hardhat treasury-renounce-admin-role --network arbitrumMainnet
+```