feat: 更新頁腳配置，增加導航欄和版權信息，改進樣式和結構

fix: 修改 getBgPath 函數以使用 this.url_for 獲取圖片的正確路徑
feat: 增加右側配置按鈕的動畫效果

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hexo-theme-butterfly",
-  "version": "5.3.5",
+  "version": "5.4.0-b1",
   "description": "A Simple and Card UI Design theme for Hexo",
   "main": "package.json",
   "scripts": {