feat: twikoo 增加 option 配置

feat: aside widget 增加排序（只對page頁和sticky內的有效）
feat: aside 增加自定義 widget
improvement: readmode 優化
improvement: html結構優化

source/js/main.js

@@ -490,7 +490,20 @@ document.addEventListener('DOMContentLoaded', function () {
  */
   const rightSideFn = {
     switchReadMode: () => { // read-mode
-      document.body.classList.toggle('read-mode')
+      const $body = document.body
+      $body.classList.add('read-mode')
+      const newEle = document.createElement('button')
+      newEle.type = 'button'
+      newEle.className = 'fas fa-sign-out-alt exit-readmode'
+      $body.appendChild(newEle)
+
+      function clickFn () {
+        $body.classList.remove('read-mode')
+        newEle.remove()
+        newEle.removeEventListener('click', clickFn)
+      }
+
+      newEle.addEventListener('click', clickFn)
     },
     switchDarkMode: () => { // Switch Between Light And Dark Mode
       const nowMode = document.documentElement.getAttribute('data-theme') === 'dark' ? 'dark' : 'light'