feat: 增加首頁評論數顯示

fix: 修復點擊toc後，滾動完toc的highlight在點擊的上一個元素
fix: 修復打賞按鈕Hover的bug close #473
improvement: 友情鏈接界面增加title顯示（top_img設為false時）
improvement: 優化toc顯示，當向上滾動時，導航欄不會遮擋 toc close #472
improvement: 升級facebook comment sdk版本

layout/includes/additional-js.pug

@@ -30,6 +30,9 @@ div
     !=partial('includes/loading/loading-js', {}, {cache: true})
 
   .js-pjax
+    if needLoadCountJs
+      !=partial('includes/third-party/card-post-count/index', {}, {cache: true})
+    
     if loadSubJs
       include ./third-party/subtitle.pug