fix: update duplicate steps

Author: Yggdrasill501

CONTRIBUTING.md

@@ -30,9 +30,6 @@ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash
 nvm install
 nvm use
 
-# Update npm
-npm install -g $(cat .npmrc)
-
 # Install Python (using Homebrew)
 brew install python3
 
@@ -56,8 +53,6 @@ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash
 nvm install
 nvm use
 
-# Update npm
-npm install -g $(cat .npmrc)
 
 # Install Python (Ubuntu/Debian)
 sudo apt update && sudo apt install python3 python3-pip python3-venv