fix: fix remaining errors

Merge pull request #41 from RedAvocado22/dev-cuong

update: order, teacher courses, course detail

Merge pull request #38 from RedAvocado22/dev-bao

fix: missing import and dependency

fix: merge conflict

fix: routing in App.tsx

feat: admin dashboard

feat: add category page

feat: admin ban/unban users

feat: add contact details page

feat: searching in landing page, newest courses instead of popular courses

feat: assign course to course manager

Merge pull request #39 from RedAvocado22/dev-cuong

feat: review and display course detail