Change buttons color on Boards, they are too ugly.

[AmenZhou]

• [x] 目录样式按照 http://dajiyuan.be/的目录 蓝色背景， 选中后
• [x] 左侧选项，选中后改变字体颜色
• [x] 左侧的tag选项，自动换行，顺序排列