GeezerVison

The "Code style" chapter tells the reader to create an .eslintrc file. That format is no longer the way ESLint is configured: flat config (eslint.config.js) has been the default since ESLint 9, and .eslintrc support was removed in ESLint 10, so following the chapter today leaves beginners with a config that ESLint ignores.

This updates that part of the section:

• install ESLint into the project (npm install --save-dev eslint) instead of globally, and mention npm init @eslint/config@latest, which generates the config;
• replace the .eslintrc example with an equivalent eslint.config.js one (same idea: start from the recommended rules, declare browser/node globals, then override a couple of rules);
• point the installation link at the current page, https://eslint.org/docs/latest/use/getting-started (the old docs/user-guide/getting-started URL now redirects).

The wording and the structure of the section are otherwise untouched.

Reported for the Russian translation in javascript-tutorial/ru.javascript.info#2187; fixing it here first so the change is not overwritten by the next upstream sync.