자잘하게 변경된 것을 올립니다.
	- 그리드
	- 세세한 거 변경
board_insert 수정
Merge branch 'master' of github.com:KimMinJeong/Collabo into board_main_contents

Conflicts:
	Board/Board_main.py
	Board/templates/board_detail.html
	Board/templates/board_insert.html
	Board/templates/contents.html
merge 후 발생한 오류 수정
Merge pull request #37 from KimMinJeong/board_main_contents

Board main contents
modify for merge