chore: update the contributing guideline to include liveblocks stuff

This step for going to Liveblocks to go get an API key and set stuff up was missing in the steps needed to set up the website locally, this commit adds it.

.github/CONTRIBUTING.md

@@ -140,7 +140,12 @@ The source code is divided into four main folders:
 
 > Note: To contribute to the website, you need to have a basic understanding of [Next.js](https://nextjs.org/docs) and [MDX.](https://mdxjs.com/)
 
-To run the website locally, you need to install the dependencies and run the development server:
+To run the website locally:
+- Go to [Liveblocks](https://liveblocks.io/) to create an account
+- Get your API key and rename the `.env.example` to `.env` 
+- Add the API key to the `NEXT_PUBLIC_LIVEBLOCKS_PUBLIC_KEY`. 
+
+Then, you'll need to install the dependencies and run the development server following the commands below: 
 
 ```bash
 pnpm install