modify board_detail
Merge branch 'master' of github.com:KimMinJeong/Collabo into KMJ
-Delete unused file,
-Modify navbard of board_top
-Entirely delete board_detail
Modify board_modify grid system
Merge pull request #37 from KimMinJeong/board_main_contents

Board main contents
board_top
modify for merge
Merge pull request #38 from KimMinJeong/KMJ

Kmj
 modify content
Merge branch 'master' of github.com:KimMinJeong/Collabo into board_main_contents
다시 merge