Description
Extend the current admin search functionality by allowing users to search for admin pages directly. This improvement will enable quick navigation to any admin page from the search bar on the admin dashboard.

Motivation
Currently, users must manually locate and navigate to specific admin pages, which can be slow and inefficient. By introducing admin page search, users will save time and improve workflow efficiency when managing the site.

Additional context
The new search should index all available admin pages and present relevant results based on titles or keywords. Consider maintaining the existing user experience and follow current design patterns for consistency.