MVC to hide "Contribute" pages and navigation in Japanese localized docs site

Background:

• The "Contribute" section is considered an "internal engineering handbook" and not product documentation content, so there is no value in translating that content
• The Technical Writing team is eventually planning to move this content to contributors.gitlab.com, but there's currently no timeline for this migration

Goal:

1. Hide the entire "Contribute" section in the Japanese docs site Keep the "Contribute" section visible in the Japanese docs site navigation, but replace content with a redirect message
2. Remove this section from navigation in the Japanese UI (by removing relevant entries from navigation yml file) Maintain the section in navigation, but create placeholder Japanese markdown files with a disclaimer message and link to the corresponding English page
3. Implement redirect that does not break navigation, keeps it as is
4. Consider this issue a prototype and derive broader set of specific requirements to handling any other non translatable content that we identify in the future hiding Contribute after this MVC issue (for example, a) what happens with links that point to the hidden sections; or b) what front end changes are needed for search_filters.vue , etc.
5. Apply the same approach^^ to other identified pages from this list (versions , deprecations): #203 (comment 2477879857)