#683 Courses added under courses section

[PVBharadwaj]

Description

I have added courses under the courses section. They open in a new tab which is user-friendly.

Fixes #683

Screenshots

Checklist

• [ ] Tests have been added or updated to cover the changes
• [ ] Documentation has been updated to reflect the changes
• [x] Code follows the established coding style guidelines
• [x] All tests are passing

[PVBharadwaj]

@aniketsinha2002 please review this pr under gssoc'23