breaking changes: 更改 rightside-bottom 為 rightside_bottom

feat: 置頂圖標改為在標題左側
feat: 可配置打賞按鈕的文字
feat: 側邊欄增加 系列文章顯示
feat: 增加 series 系列文章 標籤外掛
feat: 移除 addthis 分享
improvement: 代碼優化
improvement: tabs 標籤外掛的回到頂部箭頭位置調整
improvement: 更新 plugin.yml

layout/includes/third-party/share/add-this.pug

@@ -1,2 +0,0 @@
-.addthis_inline_share_toolbox
-script(src=`//s7.addthis.com/js/300/addthis_widget.js#pubid=${theme.addThis.pubid}` async)

layout/includes/third-party/share/index.pug

@@ -1,7 +1,5 @@
 .post_share
-  if theme.addThis.enable
-    !=partial('includes/third-party/share/add-this', {}, {cache: true})
-  else if theme.sharejs.enable
+  if theme.sharejs.enable
     include ./share-js.pug
   else if theme.addtoany.enable
     !=partial('includes/third-party/share/addtoany', {}, {cache: true})