1. Fix: random cover of prev post and next post

2. Feature: add the option to change the site name font-family
3. Feature: add the option to close instant-page
4. Fix: Display null when the sutitle not set

layout/flink.pug

@@ -6,7 +6,7 @@
         each item in i.link_list
           li.md-links-item
             a(href=item.link  title=item.name target="_blank")
-              img.lozad(data-src=item.avatar alt=item.name onerror=`onerror=null;src='${theme.lodding_bg.flink}'` height="72px")
+              img.lozad(data-src=item.avatar onerror=`onerror=null;src='${theme.lodding_bg.flink}'` height="72px")
               div(class="md-links-title")= item.name 
                 <br/>
               div(class="md-links-des")=item.descr

layout/includes/additional-js.pug

@@ -87,5 +87,6 @@ if is_home()
 
 if theme.busuanzi.site_uv || theme.busuanzi.site_pv || theme.busuanzi.page_pv
   script(async src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js")
-  
-script(src="https://cdn.jsdelivr.net/npm/instant.page@1.2.2/instantpage.min.js" type="module")
+
+if theme.instantpage.enable
+  script(src="https://cdn.jsdelivr.net/npm/instant.page@1.2.2/instantpage.min.js" type="module")

layout/includes/head.pug

@@ -113,3 +113,6 @@ if (is_archive() && preload_archive_img)
   link(rel="preload" href=url_for(preload_archive_img)  as="image" )
 else if (!is_post() && preload_img)
   link(rel="preload" href=url_for(preload_img)  as="image" )
+
+if theme.blog_title_font.font_link
+  link(rel='stylesheet', href=url_for(theme.blog_title_font.font_link))