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/third-party/card-post-count/twikoo.pug

@@ -0,0 +1,37 @@
+script.
+  (() => { 
+    const getCommentUrl = () => {
+      const eleGroup = document.querySelectorAll('#recent-posts .article-title')
+      let urlArray = []
+      eleGroup.forEach(i=>{
+        urlArray.push(i.getAttribute('href'))
+      })
+      return urlArray
+    }
+
+    const getCount = () => {
+      const runTwikoo = () => {
+        twikoo.getCommentsCount({
+          envId: '!{theme.twikoo.envId}',
+          region: '!{theme.twikoo.region}',
+          urls: getCommentUrl(),
+          includeReply: false
+        }).then(function (res) {
+          document.querySelectorAll('#recent-posts .twikoo-count').forEach((item,index) => {
+            item.innerText = res[index].count
+          })
+        }).catch(function (err) {
+          console.log(err)
+        })
+      }
+
+        if (typeof twikoo === 'object') {
+          runTwikoo()
+        } else {
+          getScript('!{theme.CDN.twikoo}').then(runTwikoo)
+        }
+    }
+
+    window.pjax ? getCount() : window.addEventListener('load', getCount)
+
+  })()