Add navData to Carbon React library for tutorial pages

[alisonjoseph]

Add navData to Carbon React library for tutorial pages
*(keep MDX source in carbon-website repository)

Update carbon.yml
https://github.com/carbon-design-system/carbon/blob/main/packages/react/carbon.yml

library:
  id: carbon-react
  name: Carbon React
  description: React implementation of Carbon Components.
  externalDocsUrl: https://react.carbondesignsystem.com
  inherits: carbon-styles
  navData:
   - title: Tutorial
     items:
       - title: Overview
         path: 'https://github.com/carbon-design-system/carbon-website/blob/main/src/pages/developing/react-tutorial/overview.mdx'
       - title: Step 1
         path: 'https://github.com/carbon-design-system/carbon-website/blob/main/src/pages/developing/react-tutorial/step-1.mdx'


.... etc

Tutorial pages in carbon-website
https://github.com/carbon-design-system/carbon-website/tree/main/src/pages/developing/react-tutorial

[alisonjoseph]

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