framework and variant explanation + corrected wrong infos

[ThomasReulen]

Description of changes:

When following the javascript quickstart guide, I noticed some irregularities between the file structure of the generated boilerplate code ( npm create vite@latest ) and the docs. I added a note for the reader to make sure to select the correct framework and variant (typescript). I corrected the path to src/styles.css and removed a reference to main.js which is not in the filesystem.

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
• amplify-libraries

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

• 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>

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Jay2113]

Can you also update the file type here to main.ts?

docs/src/pages/[platform]/start/quickstart/index.mdx

Line 218 in e485b59

The initial scaffolding already has a pre-configured data backend defined in the `amplify/data/resource.ts` file. The default example will create a Todo model with `content` field. Update your main.js file to create new to-do items.