feat: 美化 firefox 瀏覽器滾動條

fix: Utterances 評論區在多個頁面顯示的是同一個評論區
fix: 修復評論配置爲 Livere 和 Facebook Comments 時，最新評論模塊仍然顯示的 bug
improvement: blueimp_md5 CDN 可配置
improvement: timeline 優化
improvement: css優化
improvement: 友情鏈接優化

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

@@ -1,6 +1,6 @@
 - let default_avatar = theme.valine.avatar
 
-script(src="https://cdn.jsdelivr.net/npm/blueimp-md5@2.17.0/js/md5.min.js")
+script(src=url_for(theme.CDN.blueimp_md5))
 script.
   window.addEventListener('load', () => {
     const changeContent = (content) => {

layout/includes/third-party/pjax.pug

@@ -3,20 +3,18 @@ if theme.pjax.exclude
   each val in theme.pjax.exclude
     - pjaxExclude = pjaxExclude + `:not([href="${val}"])`
 
+- let pjaxSelectors = ['title','#config-diff','#body-wrap','#rightside-config-hide','#rightside-config-show','.js-pjax']
+
+- let choose = theme.comments.use
+if choose
+  if theme.Open_Graph_meta && (choose.includes('Livere') || choose.includes('Utterances') || choose.includes('Giscus'))
+    - pjaxSelectors.unshift('meta[property="og:image"]', 'meta[property="og:title"]', 'meta[property="og:url"]')
+  if choose.includes('Utterances') || choose.includes('Giscus')
+    - pjaxSelectors.unshift('link[rel="canonical"]')
+
 script(src=url_for(theme.CDN.pjax))
 script.
-  let pjaxSelectors = [
-    'title',
-    '#config-diff',
-    '#body-wrap',
-    '#rightside-config-hide',
-    '#rightside-config-show',
-    '.js-pjax'
-  ]
-
-  if (!{Boolean(theme.Open_Graph_meta && theme.comments.use && theme.comments.use.includes('Livere'))}) {
-    pjaxSelectors.unshift('meta[property="og:image"]', 'meta[property="og:title"]', 'meta[property="og:url"]')
-  }
+  let pjaxSelectors = !{JSON.stringify(pjaxSelectors)}
 
   var pjax = new Pjax({
     elements: '!{pjaxExclude}',