chore: add v13 versioned docs

Author: mdjastrzebski

website/docs/13.x/docs/start/intro.md

@@ -1,5 +1,11 @@
 # Introduction
 
+:::warning
+
+This guide is for version 13.x of React Native Testing Library which is currently in alpha!
+
+:::
+
 ## The problem
 
 You want to write maintainable tests for your React Native components. As a part of this goal, you want your tests to avoid including implementation details of your components and focus on making your tests give you the confidence they are intended. As part of this, you want your tests to be maintainable in the long run so refactors of your components (changes to implementation but not functionality) don't break your tests and slow you and your team down.

website/docs/13.x/docs/start/quick-start.mdx

@@ -2,26 +2,28 @@ import { PackageManagerTabs } from 'rspress/theme';
 
 # Quick Start
 
+:::warning
+
+This guide is for version 13.x of React Native Testing Library which is currently in alpha!
+
+:::
+
 ## Installation
 
 Open a Terminal in your project's folder and run:
 
 <PackageManagerTabs
   command={{
-    yarn: 'yarn add -D @testing-library/react-native',
-    npm: 'npm install -D @testing-library/react-native',
+    yarn: 'yarn add -D @testing-library/react-native@alpha',
+    npm: 'npm install -D @testing-library/react-native@alpha',
   }}
 />
 
 This library has a peer dependency for `react-test-renderer` package. Make sure that your `react-test-renderer` version matches exactly your `react` version.
 
 ### Jest matchers
 
-To set up React Native-specific Jest matchers, add the following line to your `jest-setup.ts` file (configured using [`setupFilesAfterEnv`](https://jestjs.io/docs/configuration#setupfilesafterenv-array)):
-
-```ts title=jest-setup.ts
-import '@testing-library/react-native/extend-expect';
-```
+RNTL v13 automatically extends Jest with React Native-specific matchers. The only thing you need to do is to import anything from `@testing-library/react-native` which you already need to do to access the `render` function.
 
 ### ESLint plugin
 

website/rspress.config.ts

@@ -19,7 +19,7 @@ export default defineConfig({
   },
   multiVersion: {
     default: '12.x',
-    versions: ['12.x'],
+    versions: ['12.x', '13.x'],
   },
   route: {
     cleanUrls: true,