chore: add Gen2 specific doc for using SSR adapter with Nuxt 3

[HuiSF]

Description of changes:

Ported the Nuxt 3 doc from the Gen1 section with:

1. Replaced amplifyconfiguration.json with amplify_outputs.json
2. Replaced Gen1 GraphQL client with Gen2 Typebeast Data client
3. Updated Storage example to use the new path parameters instead of accessLevel
4. Some minor cleanups
5. Removed the accordion wrappers from code examples (feedback from @josefaidt)

Related GitHub issue #, if available:

Instructions

If this PR should not be merged upon approval for any reason, please submit as a DRAFT

Which product(s) are affected by this PR (if applicable)?

• [ ] amplify-cli
• [ ] amplify-ui
• [ ] amplify-studio
• [ ] amplify-hosting
• [x] amplify-libraries

Which platform(s) are affected by this PR (if applicable)?

• [x] JS
• [ ] Swift
• [ ] Android
• [ ] Flutter
• [ ] React Native

Please add the product(s)/platform(s) affected to the PR title

Checks

• [ ] Does this PR conform to the styleguide?

• [ ] Does this PR include filetypes other than markdown or images? Please add or update unit tests accordingly.

• [ ] Are any files being deleted with this PR? If so, have the needed redirects been created?

• [ ] Are all links in MDX files using the MDX link syntax rather than HTML link syntax?
  ref: MDX: [link](https://docs.amplify.aws/) HTML: <a href="https://docs.amplify.aws/">link</a>

When this PR is ready to merge, please check the box below

• [ ] Ready to merge

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