This commit introduces a new page to display the alumni association's organizational structure.
- Adds a new page at `/about/org-structure` to showcase the committee members.
- Displays each member's photo, position, name, and a brief description of their role.
- The structure is organized into categories: Leadership Team, Functional Departments, and Specialized Departments.
- A navigation link has been added to the main layout sidebar for easy access.
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