URL design
/ -> home /join -> Join /login -> Login /search -> Search
/edit-user -> Edit user ==> /users/edit /delete-user -> Delete user ===>/users/delete
/watch-video -> "" ===> /videos/watch /edit-video -> ""===> /videos/edit /delete-video
최고의 방법은 아니다. ===> 이게 낫다.
#4.6 플랜 / -> home /join /login /search
/users/:id -> see user profile /users/edit /users/delete /users/logout
/videos/:id -> 동영상의 아이디 /videos/:id/edit /videos/:id/delete /videos/upload