Add course schedule feature to teaching page (#2258)

[Michael-Jiahao-Zhang]

Implements the course schedule feature requested in issue #2258.

This PR adds a new course schedule feature to the al-folio theme, allowing academics to easily create and display structured course information.

Changes:

• Added a courses collection to organize and display academic courses
• Created course layout and display templates with responsive design
• Implemented organization by year and term with automatic sorting
• Added support for weekly schedule with topics and course materials
• Simplified documentation with a README for course creation

This feature makes it easier for academics to showcase their teaching materials with a consistent, organized display of course schedules, helping users create professional teaching pages without custom implementation.

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.