FSD: Widget Courses

[Quiddlee]

📝 Describe the refactoring task

Part of the issue #347

📍 Code location

src/widgets/courses

✅ Definition of Done (DoD):

1. Refactor courses.tsx's scss to scss modules

• remove all parent selector & .card-content -> .card-content.
• change all possible values to variables if such exists.
• and everything in your opinion that needs to be refactored

courses.tsx

1. move courses.test.tsx to ui folder
2. rename other-courses.test.tsx to courses.test.tsx