fix: replaced target from main tag to div with id "root" for semantic HTML

[SvMak]

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

Thank you for so great plugin!

The <main> tag specifies the main content of a document.
The content inside the <main> element should be unique to the document. It should not contain any content that is repeated across documents such as sidebars, navigation links, copyright information, site logos, and search forms.

In my case I need use semantic markup for predefined @fastify/react and I make small fixes.

Additional: upgraded vitest veresion to ^1.0.0 for examples packages.

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