fix(playground): update template generator to support Angular standalone

[brandyscarney]

Updates the template generator to support Angular standalone.

How to test these changes:

1. Navigate to the ionic-docs repository

2. Run npm run playground:new

3. Select the following options when prompted:

   ? Is this playground for a component? › yes
   ? Which component is this playground for? › ion-button
   ? What should the playground path be? › withcss
   ? Select the Ionic Framework version for the playground › 8
   ? Generate custom CSS files? › yes

4. Run npm run playground:new again, but this time select the following options:

   ? Is this playground for a component? › yes
   ? Which component is this playground for? › ion-button
   ? What should the playground path be? › withoutcss
   ? Select the Ionic Framework version for the playground › 8
   ? Generate custom CSS files? › no

5. Add the following to docs/api/button.md before the ## Basic Usage section:

   ## Withcss
   
   import Withcss from '@site/static/usage/v8/button/withcss/index.md';
   
   <Withcss />
   
   ## Withoutcss
   
   import Withoutcss from '@site/static/usage/v8/button/withoutcss/index.md';
   
   <Withoutcss />

6. Start the docs server: npm run start

7. Open your browser and navigate to http://localhost:3000/docs/api/button

8. Verify the following:

   • The Angular code examples look correct
   • The StackBlitz previews open without issues

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Name	Status	Preview	Comments	Updated (UTC)
ionic-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 31, 2024 3:53pm

[brandyscarney]

This change was made because running npm run lint after adding a new playground was removing the () but this makes it so it passes lint and supports adding more child components.