message: move new OVM instructions from README to docs folder
diff: @@ -83,10 +83,10 @@ npx hardhat run --network xdai scripts/deploy-net-emissions-token-network.js
  By default, Hardhat compiles to the EVM using the given Solidity version in `hardhat.config.js`. To instead compile to the [OVM](https://optimism.io/):
  -1. Uncomment the line in `hardhat.config.js`:
  +1. Set the `OVM` environment variable:
  -```js
  -// require("@eth-optimism/plugins/hardhat/compiler");
  +```bash
  +export OVM=1
  ```
  2. If build artifacts exist, run `npx hardhat clean`
  