docs: update get-started to the new @eslint/create-config (#18217)

* docs: update get-started to the new `@eslint/create-config`

* Update README.md

* Update getting-started.md

README.md

@@ -59,15 +59,11 @@ After that, you can run ESLint on any file or directory like this:
 
 ## Configuration
 
-After running `npm init @eslint/config`, you'll have an `.eslintrc` file in your directory. In it, you'll see some rules configured like this:
-
-```json
-{
-    "rules": {
-        "semi": ["error", "always"],
-        "quotes": ["error", "double"]
-    }
-}
+After running `npm init @eslint/config`, you'll have an `eslint.config.js` or `eslint.config.mjs` file in your directory. In it, you'll see some rules configured like this:
+
+```js
+import pluginJs from "@eslint/js";
+export default [ pluginJs.configs.recommended, ];
 ```
 
 The names `"semi"` and `"quotes"` are the names of [rules](https://eslint.org/docs/rules) in ESLint. The first value is the error level of the rule and can be one of these values:

docs/src/use/getting-started.md

@@ -27,25 +27,11 @@ npm init @eslint/config
 If you want to use a specific shareable config that is hosted on npm, you can use the `--config` option and specify the package name:
 
 ```shell
-# use `eslint-config-semistandard` shared config
+# use `eslint-config-standard` shared config
 
 # npm 7+
-npm init @eslint/config -- --config semistandard
+npm init @eslint/config -- --config eslint-config-standard
 
-# or (`eslint-config` prefix is optional)
-npm init @eslint/config -- --config eslint-config-semistandard
-
-# ⚠️ npm 6.x no extra double-dash:
-npm init @eslint/config --config semistandard
-
-```
-
-The `--config` flag also supports passing in arrays:
-
-```shell
-npm init @eslint/config -- --config semistandard,standard
-# or
-npm init @eslint/config -- --config semistandard --config standard
 ```
 
 **Note:** `npm init @eslint/config` assumes you have a `package.json` file already. If you don't, make sure to run `npm init` or `yarn init` beforehand.