refactor: toTop button 简化返回顶部代码

Enable toTop button via <div id="toTop”> consistent with toBottom.
使用锚点<div id="toTop”>替换原来的JavaScript，更简洁统一。

themes/Yilia/layout/_partial/article.ejs

@@ -49,25 +49,26 @@
         }
         </script>
         
-        <div id="toTop">↑</div>
-        <script>
+        <div id="toTop">
+        <a href="#top" style="color:white">↑</a>
+        </div>
+        <!-- to top via JavaScript -->
+        <!--<script>
         window.onload = function(){
           var to_top = document.getElementById("toTop");
           to_top.onclick = function(){
             document.documentElement.scrollTop = document.body.scrollTop =0;
           }
         }  
-        </script>
-
+        </script>-->
         <div id="toBottom">
         <a href="#footer" style="color:white">↓</a>
         </div>
-
     <!-- to bottom via JavaScript -->
     <!--<div id="toBottom">
         <a href="javascript:void(0);" onclick="javascript:document.getElementsByTagName('BODY')[0].scrollTop=document.getElementsByTagName('BODY')[0].scrollHeight;">↓</a>
         </div> -->
-        
+
 
         <%- post.content %>
       <% } %>