add SSH1.png figure, discourage "git config pull.rebase true" #18
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Resolves #15
그리고 기본 Git 설정에서 pull.rebase를 사용하지 않고 default로 pull하도록 하였습니다.
왜냐하면 pull.rebase를 사용할 경우 Git commit history가 직선으로 나타나 Software Engineering 관점에서 history를 이해하기 쉬워진다는 장점이 있지만, merge conflict가 발생할 때 하나의 해결 커밋으로 머지가 되는 것이 아닌, 해당 PR에 존재하는 모든 각각의 커밋들에 대해 일일이 컨플릭트를 수정해야 하는 번거로운 상황이 발생하기 때문입니다. 따라서 Git 초보자에게
pull.rebase true
가 권장되지 않는다고 판단하였고, 그래서 내용을 수정하였습니다.