feat(web): implement client-side course search

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User Story / Goal

As a user, I want to search for courses on the website so that I can quickly find courses I am interested in.

Acceptance Criteria

• A search bar is visible on the courses page.
• The application fetches a courses.json file from /assets/courses.json.
• As a user types in the search bar, the list of courses is filtered in real-time.
• The search matches against the course_name.
• If no results are found, a "No courses found" message is displayed.

Technical Breakdown (Optional)

• Create a new search component in the apps/web package.
• Use a state management solution to hold the full course list and the filtered results.
• Fetch /assets/courses.json when the main app component loads.
• The course id (slug) will be used to navigate to the course's detail page.

Designs / Mockups (Optional)

No response