breaking changes: cdn 可一鍵設置 本地文件/可單獨配置主題文件，第三方文件的 cdn

breaking changes: 移除 utterances，giscus， addtoany， busuanzi 的 cdn 配置

layout/includes/third-party/newest-comments/valine.pug

@@ -1,6 +1,6 @@
 - let default_avatar = theme.valine.avatar
 
-script(src=url_for(theme.CDN.blueimp_md5))
+script(src=url_for(theme.asset.blueimp_md5))
 script.
   window.addEventListener('load', () => {
     const changeContent = (content) => {