Update running-testnet-node.md

1. Both Release and Debug is being installed which maybe not needed. 
2. stacks-node debug execution may not be needed to avoid confusion like https://github.com/blockstack/docs/issues/833

src/pages/stacks-blockchain/running-testnet-node.md

@@ -52,10 +52,6 @@ git clone https://github.com/blockstack/stacks-blockchain.git; cd stacks-blockch
 Install the Stacks node by running:
 
 ```bash
-cargo build --workspace --bin stacks-node
-# binary will be in target/debug/stacks-node
-./target/debug/stacks-node krypton
-# release build
 cargo build --workspace --release --bin stacks-node
 # binary will be in target/release/stacks-node
 ```