doc: update README.md

Author: tamtamchik

README.md

@@ -80,23 +80,3 @@ To fix this `chainId` must not be set in the forked node. To do so set `DONT_SET
 - merge the PR
 - create a new tag with the version `git tag -a <version> -m "Hardhat version <version>"`
 - push the tag `git push --tags`
-
-### Available Environment Variables
-
-The following environment variables can be used to configure the hardhat node:
-
-- `INFURA_TOKEN` - Token for Infura provider
-- `ALCHEMY_TOKEN` - Token for Alchemy provider
-- `ETH_RPC_URL` - Custom Ethereum RPC URL
-- `ARB_RPC_URL` - Custom Arbitrum RPC URL
-- `OPT_RPC_URL` - Custom Optimism RPC URL
-- `DONT_SET_CHAIN_ID` - Set to any value to prevent setting chainId (useful when forking)
-- `HARDFORK` - Specify the hardfork to use (defaults to "cancun")
-
-### Available Node Types
-
-The following node types are available as different Docker image tags:
-
-- `:latest` or `:<version>` - Mainnet fork node
-- `:<version>-scratch` - Fresh node without forking
-- `:<version>-hoodi-fork` - Hoodi network fork node