Edit README.md

Remove the old usage and fix a typo

Author: pepyakin

README.md

@@ -2,7 +2,7 @@
 
 2 steps are required before:
 + build sugondat-chain
-+ Adjust the PATHs to polkadot and sugondat-chain for zomienet
++ Adjust the PATHs to polkadot and sugondat-chain for zombienet
 
 Now you can launch 2 polkadot validators and one sugondat-chain collator
 ``` sh
@@ -31,21 +31,3 @@ cd demo/demo-rollup
 # clean the ledger db
 make clean
 ```
-
-# Usage
-
-To launch the testnet you should use `zombienet`.
-
-    # First, make sure that the binaries `polkadot` and `sugondat-node` are in your PATH.
-    # If you're using a polkadot binary >=1.0.0 then you need also the binaries 
-    # polkadot-execute-worker and polkadot-prepare-worker
-    export PATH=/Users/pepyakin/dev/parity/polkadot/target/release/:$PATH
-    export PATH=/Users/pepyakin/dev/parity/sugondat-chain/sugondat-chain/target/release/:$PATH
-
-    # Then, launch the testnet.
-    #
-    # You will find logs in the `zombienet` directory.
-    #
-    # In order to relaunch the testnet, you should remove the `zombienet` directory.
-    ./bin/zombienet-macos spawn -p native --dir zombienet testnet.toml
-