[git] 원격 저장소 접근시 권한 오류

1. push / pull 할 때 자꾸 발생 오류

Support for password authentication was removed on August 13, 2021. Please use a personal access token instead.

2. 레포지토리 접근 토근 만들어 해결

https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token