This commit introduces a new page dedicated to the 'Middle Highschool Tuition Class' of 1956 (中补班). The page displays a letter written in 2022, calling for a reunion of these special alumni. A navigation
link has been added to the 'About' section for easy access to this historical content.
This commit introduces a new page detailing the founding history of the alumni association.
- Adds the new page at `/about/founded-history` which includes the origin story, organizational structure, and a list of donors for the clubhouse.
- Restructures the `/about` route by moving the existing page to `/about/index` to accommodate nested pages.
- Updates the main navigation menu to include a dropdown link to the new 'Founding History' page.
- Adds a link to the old alumni website under 'Friendly Links' for historical reference.
