Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -68,21 +68,26 @@ You'll need the following:
 * [Docker Compose](https://docs.docker.com/compose/install/)
 * [Foundry](https://getfoundry.sh)
 
-### Install the Correct Version of NodeJS
+### Setup
 
-Using `nvm`, install the correct version of NodeJS.
+Clone the repository and open it:
 
+```bash
+git clone git@github.com:ethereum-optimism/optimism.git
+cd optimism
 ```
+
+### Install the Correct Version of NodeJS
+
+Using [nvm](https://github.com/nvm-sh/nvm), install the correct version of NodeJS.
+
+```bash
 nvm use
 ```
 
-### Setup
-
-Clone the repository, open it, and install nodejs packages with `yarn`:
+### Install node packages with Yarn
 
 ```bash
-git clone git@github.com:ethereum-optimism/optimism.git
-cd optimism
 yarn install
 ```