Replace JS blog-starter example with TS, deprecate blog-starter-typescript example

[maxproske]

Replaced the main JavaScript blog-starter example with the TypeScript example, as was done with with-chakra-ui-typescript and with-chakra-ui.

It sounds like all examples will be TypeScript going forward, and it's less to maintain. #36333 (review)

The move:

• Removed JS blog-starter example
• Renamed TS blog-starter-typescript example to blog-starter
• Added move notice at blog-starter-typescript/README.md

Improvements:

• Upgraded all dependencies
• Removed unused @types/jest dependency
• Refactored split const/export page components to use export default function
• Renamed types/ to interfaces/ to match with-typescript example

Documentation / Examples

• Make sure the linting passes by running pnpm lint
• The examples guidelines are followed from our contributing doc