docs: remove install command

docs/src/user-guide/getting-started.md

@@ -20,17 +20,7 @@ ESLint is a tool for identifying and reporting on patterns found in ECMAScript/J
 
 Prerequisites: [Node.js](https://nodejs.org/en/) (`^12.22.0`, `^14.17.0`, or `>=16.0.0`) built with SSL support. (If you are using an official Node.js distribution, SSL is always built in.)
 
-You can install ESLint using npm or yarn:
-
-```shell
-npm install eslint --save-dev
-
-# or
-
-yarn add eslint --dev
-```
-
-You should then set up a configuration file, and the easiest way to do that is:
+The easiest way to initialize ESLint is:
 
 ```shell
 npm init @eslint/config