chore: use npm2yarn consistently

Author: nickserv

docs/ecosystem-user-event.mdx

@@ -3,9 +3,6 @@ id: ecosystem-user-event
 title: user-event v13
 ---
 
-import Tabs from '@theme/Tabs'
-import TabItem from '@theme/TabItem'
-
 [`user-event`][gh] is a companion library for Testing Library that provides more
 advanced simulation of browser interactions than the built-in
 [`fireEvent`](dom-testing-library/api-events.mdx#fireevent) method.
@@ -21,23 +18,10 @@ fixes and new features.
 
 ## Installation
 
-  <Tabs defaultValue="npm" values={[{ label: 'npm', value: 'npm' }, { label: 'Yarn', value: 'yarn' }]}>
-  <TabItem value="npm">
-
-```sh
+```bash npm2yarn
 npm install --save-dev @testing-library/user-event @testing-library/dom
 ```
 
-  </TabItem>
-  <TabItem value="yarn">
-
-```sh
-yarn add --dev @testing-library/user-event @testing-library/dom
-```
-
-  </TabItem>
-  </Tabs>
-
 Now simply import it in your tests:
 
 ```js

docs/user-event/install.mdx

@@ -3,29 +3,10 @@ id: install
 title: Installation
 ---
 
-import Tabs from '@theme/Tabs'
-import TabItem from '@theme/TabItem'
-
-<Tabs defaultValue="npm" values={[
-    { label: 'npm', value: 'npm' },
-    { label: 'Yarn', value: 'yarn' },
-]}>
-<TabItem value="npm">
-
-```sh
+```bash npm2yarn
 npm install --save-dev @testing-library/user-event
 ```
 
-</TabItem>
-<TabItem value="yarn">
-
-```sh
-yarn add --dev @testing-library/user-event
-```
-
-</TabItem>
-</Tabs>
-
 Note that `@testing-library/user-event` requires `@testing-library/dom`.
 
 If you use one of the