Refactor dynamic page paths and localize blog posts

[zanhk]

• Refactored dynamic page paths in the change-language-in-dynamic-pages.js script to use a simplified format.
• Updated the path for blog post links in the posts.astro component to include localized paths.
• Renamed and reorganized files related to dynamic blog pages, including categories and tags, to follow a consistent structure.
• Modified the logic for generating static paths in the [...page].astro files to include the "blog" prefix.
• Updated rendering logic in the [slug].astro files to retrieve and display post data correctly based on language selection.

These changes improve code organization and ensure that blog posts are properly localized.

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