fix(NextJS example): blog page imports

[rjvelazco]

This pull request includes changes to the examples/nextjs project, specifically focusing on improving the handling of blog post paths and fixing an import statement. The most important changes include updating the path generation for blog posts and correcting the import path for the Header component.

Path handling improvements:

• examples/nextjs/src/app/blog/post/[[...slug]]/page.js: Updated the generateMetadata and Home functions to use a more specific path format for blog posts. This change removes the default fallback path and ensures that the path is always correctly prefixed with blog/post/. (examples/nextjs/src/app/blog/post/[[...slug]]/page.jsL17-R19, examples/nextjs/src/app/blog/post/[[...slug]]/page.jsL40-R43)

Import path correction:

• examples/nextjs/src/components/my-blog-page.js: Fixed the import path for the Header component to ensure it correctly points to header/header.

This PR fixes: #30607