Update directory structure and cleanup imports

README.md

src/misc/Cookie.tsx

src/pages/404.tsx

src/pages/_app.tsx

src/pages/courses.tsx

src/pages/dynamic_course_listing.tsx

src/pages/dynamic_player.tsx

src/pages/feedback.tsx

src/pages/index.tsx

src/pages/internal/changelog.tsx

src/pages/internal/dbstatus.tsx

src/pages/internal/import.tsx

src/pages/internal/stats.tsx

src/pages/internal/streaming.tsx

src/pages/internal/timetable.tsx

src/pages/internal/user.tsx

src/pages/search.tsx

src/videoag/api/ApiError.tsx

src/videoag/api/ApiProvider.tsx

src/videoag/api/Backend.tsx