feat: aside 可配置隐藏/增加按钮可展开或收缩aside

layout/includes/layout.pug

@@ -1,7 +1,8 @@
+- var htmlClassHideAside = theme.aside.enable && theme.aside.hide ? 'hide-aside' : ''
 - var hideAside = !theme.aside.enable || page.aside === false ? 'hide-aside' : ''
 
 doctype html
-html(lang=config.language data-theme=theme.display_mode)
+html(lang=config.language data-theme=theme.display_mode class=htmlClassHideAside)
   head
     include ./head.pug
   body