Update 3-installation.md

Author: rigor789

content/docs/en/getting-started/3-installation.md

@@ -9,9 +9,6 @@ To use NativeScript-Vue, you need to set up your system to compile your apps.
 
 - [Node.js](#nodejs)
 - [NativeScript CLI](#nativescript-cli)
-- [Windows](#windows) (for developing Android applications on Windows)
-- [macOS](#macos) (for developing iOS and Android applications on macOS)
-- [Linux](#linux) (for developing Android applications on Linux)
 
 ### Node.js
 
@@ -27,20 +24,4 @@ $ npm install -g nativescript
 
 Verify the installation was successful by running `tns` in your terminal. You should see a list of the available commands.
 
-### Windows
-
-Check the system requirements and follow the setup instructions for the Android SDK on Windows:
-
-[Advanced setup: Windows](https://docs.nativescript.org/start/ns-setup-win)
-
-### macOS
-
-Check the system requirements and follow the setup instructions for Xcode and the Android SDK on macOS:
-
-[Advanced setup: macOS](https://docs.nativescript.org/start/ns-setup-os-x)
-
-### Linux
-
-Check the system requirements and follow the setup instructions for the Android SDK on Linux:
-
-[Advanced setup: Linux](https://docs.nativescript.org/start/ns-setup-linux)
+For setting up your system, follow the official docs here: https://docs.nativescript.org/environment-setup.html