Fix SEO indexing for CRE SDK language pages

Problem:

• Search engines were not indexing -ts and -go pages correctly because they were following the redirect page and treating one language as the canonical version of the other
• Shared links to a specific language page (e.g., /overview-go) would redirect users to their preferred language, breaking the shared link experience.

Solution:

• Added noindex meta tag to redirect pages so Google ignores them and indexes -ts and -go pages independently.
• Removed auto-redirect on language-specific pages so shared links work correctly—users now stay on the linked page instead of being redirected based on their stored preference.