feature:

引入react-fontawesome，升级至v5.15;
next/link补齐passHref;
替换img为next/Image,优化图片

components/ShareButton.js

@@ -1,5 +1,7 @@
 import React from 'react'
 import ShareBar from '@/components/ShareBar'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faShareAltSquare } from '@fortawesome/free-solid-svg-icons'
 
 /**
  * 悬浮在屏幕右下角,分享按钮
@@ -25,7 +27,7 @@ const ShareButton = ({ post }) => {
         </div>
         <div ref={btnRef}
           className='z-20 border dark:border-gray-500 dark:bg-gray-600 bg-white cursor-pointer text-md hover:shadow-2xl shadow-lg'>
-          <i className='transform duration-200 hover:scale-150 dark:text-gray-200 p-4 fa fa-share-alt' title='share' />
+          <FontAwesomeIcon icon={faShareAltSquare} className='transform duration-200 hover:scale-150 dark:text-gray-200 p-4' title='share' />
         </div>
     </div>
   )