Hexo-Butterfly只保留主页顶部图，去除其他页面顶部图

修改 /themes/butterfly/layout/includes/header/index.pug 文件

var isHomeClass = is_home() ? 'full_page' : 'not-home-page'
后面添加或者修改为
var isHomeClass = is_home() ? 'full_page' : 'not-top-img'
top_img = is_home()