deps: add missing module typescript

refactor: hierarchy of colors

feat(auth): supports OAuth 2.0 for Naver

feat(auth): supports OAuth 2.0 for NAVER (+1 squashed commits)

code clean up

fix: display error message when failed

fix: convert type of `account_id` to string

refactor: move constants into module

refactor: create base class OAuthBackend

feat(auth.kakao): implements update user profile

feat(auth): implements Kakao OAuth 2.0

refactor(auth.redirects): pull components up

docs: add sample environment file

fix(oauth2): do not update profile when not null

feat(auth): supports Github OAuth 2.0