feat: 增加 post_pagination 配置(可關閉/配置分頁展示邏輯)

feat: 可配置最新評論的緩存時間
fix: 修復pjax下不會跳轉404頁面的bug
fix: 修復手持設備橫向翻轉時，menu 沒有進行判斷,而導致樣式錯亂的bug
fix: 修復文字點擊關閉random無效的bug
fix: 修復子目錄下，打賞圖片跳轉鏈接會錯誤的bug
improvement: 文章版權右上角改為 版權icon
improvement: pangu的操作範圍增大到 body-wrap裏的內容
improvement: pug 判斷優化
improvement: 最新評論js優化
remove: 移除 fragment_cache 配置（默認開啟）
remove: 移除百度推送（百度已棄用）和百度轉碼

source/css/_layout/post.styl

@@ -218,24 +218,13 @@ no-beautify()
     transition: box-shadow .3s ease-in-out
 
     &:before
+      @extend .fontawesomeIcon
       position: absolute
-      top: t = .5rem
-      right: t
-      width: w = .8rem
-      height: w
-      border-radius: w
-      background: $light-blue
-      content: ''
-
-    &:after
-      position: absolute
-      top: t = .7rem
-      right: t
-      width: w = .4rem
-      height: w
-      border-radius: w
-      background: var(--card-bg)
-      content: ''
+      top: .1rem
+      right: .6rem
+      color: $theme-color
+      content: '\f1f9'
+      font-size: 1rem
 
     &:hover
       box-shadow: 0 0 8px 0 rgba(232, 237, 250, .6), 0 2px 4px 0 rgba(232, 237, 250, .5)