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

source/css/var.styl

@@ -162,7 +162,7 @@ $note-modern-danger-bg = lighten(spin($note-modern-danger-border, 10), 35% + ($l
 $note-modern-danger-text = #a94442
 $note-modern-danger-hover = darken(spin($note-modern-danger-text, -10), 22%)
 // Tag Plugins - Button/note
-$tagsP-types = 'blue' 'pink' 'red' 'purple' 'orange' 'green'
+$color-types = 'blue' 'pink' 'red' 'purple' 'orange' 'green'
 $btn-color = #fff
 $btn-default-color = #777
 $tagsP-blue-color = #428bca
@@ -179,7 +179,5 @@ $tab-button-hover-bg = darken($tab-border-color, 8)
 $tab-active-border-color = $theme-color
 $tab-button-active-bg = $card-bg
 $tab-to-top-color = #99a9bf
-
-// timeline
-$timeline-content-bg = #f6f6f6
-$timeline-border-color = $theme-color
+// Tag Plugins - timeline
+$timeline-default-color = $theme-color