Remove non-existent install options from local-installation.md (#16)

* Remove non-existent install options from local-installation.md

* Remove brew install from local-installation.md

* Change npm install command in local-installation.md

Author: graydonhope

docs/local-installation.md

@@ -157,17 +157,8 @@ Socket Basics orchestrates multiple security tools. Install the ones you need:
 **Installation:**
 
 ```bash
-# macOS/Linux with Homebrew:
-brew install socket
-
 # Using npm (if you have Node.js):
-npm install -g @socketsecurity/cli
-
-# Manual installation (Linux):
-curl -sSL https://socket.dev/install.sh | sh
-
-# Manual installation (macOS):
-curl -sSL https://socket.dev/install.sh | sh
+npm install -g socket
 
 # Verify installation
 socket --version