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/comments/disqusjs.pug

@@ -5,7 +5,7 @@ script.
     function addDisqusjsCSS () {
       const ele = document.createElement('link')
       ele.rel = 'stylesheet'
-      ele.href= '!{url_for(theme.CDN.disqusjs_css)}'
+      ele.href= '!{url_for(theme.asset.disqusjs_css)}'
       document.getElementsByTagName('head')[0].appendChild(ele)
     }
 
@@ -26,7 +26,7 @@ script.
     if (window.disqusJsLoad) initDisqusjs()
     else {
       addDisqusjsCSS()
-      getScript('!{url_for(theme.CDN.disqusjs)}').then(initDisqusjs)
+      getScript('!{url_for(theme.asset.disqusjs)}').then(initDisqusjs)
       window.disqusJsLoad = true
     }
   }

layout/includes/third-party/comments/giscus.pug

@@ -5,7 +5,7 @@ script.
     let nowTheme = document.documentElement.getAttribute('data-theme') === 'dark' ? '!{themes.dark}' : '!{themes.light}'
 
     const config = Object.assign({
-      src: '!{theme.CDN.giscus}',
+      src: 'https://giscus.app/client.js',
       'data-repo': '!{repo}',
       'data-repo-id': '!{repo_id}',
       'data-category-id': '!{category_id}',

layout/includes/third-party/comments/gitalk.pug

@@ -2,7 +2,7 @@ script.
   function addGitalkSource () {
     const ele = document.createElement('link')
     ele.rel = 'stylesheet'
-    ele.href= '!{url_for(theme.CDN.gitalk_css)}'
+    ele.href= '!{url_for(theme.asset.gitalk_css)}'
     document.getElementsByTagName('head')[0].appendChild(ele)
   }
 
@@ -24,7 +24,7 @@ script.
     if (typeof Gitalk === 'function') initGitalk()
     else {
       addGitalkSource()
-      getScript('!{url_for(theme.CDN.gitalk)}').then(initGitalk)
+      getScript('!{url_for(theme.asset.gitalk)}').then(initGitalk)
     }
   }