feat(dev): Update CONTRIBUTING

CONTRIBUTING.md

@@ -173,8 +173,6 @@ Once you have freeCodeCamp cloned, before you start the application, you first n
 # Install NPM dependencies
 npm install
 
-# Install Gulp globally
-npm install -g gulp
 ```
 
 Then you need to add the private environment variables (API Keys):
@@ -215,7 +213,7 @@ mongod
 npm run only-once
 
 # start the application
-gulp
+npm run develop
 ```
 
 Now navigate to your browser and open
@@ -233,7 +231,7 @@ congratulations – you're all set. Otherwise, let us know by asking in the [Con
 node seed
 
 # Re-start the application
- gulp
+npm run develop
 ```
 
 ### Make Changes