breaking changes: widget 寫法更改/可添加非sticky區域widget

feat: 升級facebook comment js 到 v10
fix: 修復當內容過少時， footer 沒有底部靠攏的bug
improvement: 404頁面不再顯示 rightside

layout/includes/widget/card_bottom_self.pug

@@ -1,5 +1,5 @@
-if site.data.widget
-  each item in site.data.widget
+if site.data.widget && site.data.widget.bottom
+  each item in site.data.widget.bottom
     .card-widget(class=item.class_name id=item.id_name style=item.order ? `order: ${item.order}` : '')
       .item-headline
         i(class=item.icon)

layout/includes/widget/card_top_self.pug

@@ -0,0 +1,8 @@
+if site.data.widget && site.data.widget.top
+  each item in site.data.widget.top
+    .card-widget(class=item.class_name id=item.id_name)
+      .item-headline
+        i(class=item.icon)
+        span=item.name
+      .item-content
+        !=item.html

layout/includes/widget/index.pug

@@ -7,6 +7,7 @@
     else
       !=partial('includes/widget/card_author', {}, {cache: true})
       !=partial('includes/widget/card_announcement', {}, {cache: true})
+      !=partial('includes/widget/card_top_self', {}, {cache: true})      
       .sticky_layout
         if showToc
           include ./card_post_toc.pug
@@ -16,6 +17,8 @@
     //- page
     !=partial('includes/widget/card_author', {}, {cache: true})
     !=partial('includes/widget/card_announcement', {}, {cache: true})
+    !=partial('includes/widget/card_top_self', {}, {cache: true})      
+
     .sticky_layout
       !=partial('includes/widget/card_recent_post', {}, {cache: true})
       !=partial('includes/widget/card_ad', {}, {cache: true})
@@ -24,4 +27,4 @@
       !=partial('includes/widget/card_tags', {}, {cache: true})
       !=partial('includes/widget/card_archives', {}, {cache: true})
       !=partial('includes/widget/card_webinfo', {}, {cache: true})
-      !=partial('includes/widget/card_self', {}, {cache: true})
+      !=partial('includes/widget/card_bottom_self', {}, {cache: true})