增加注释

src/main/webapp/WEB-INF/common/_sidebar.html

 <aside class="left-sidebar">
     <div class="scroll-sidebar">
+
+        <!--顶部用户头像部分-->
         <div class="user-profile">
             <div class="profile-img"> <img src="${avatar}" alt="user" /> </div>
             <div class="profile-text">
@@ -11,6 +13,8 @@
                 </div>
             </div>
         </div>
+
+        <!--菜单条-->
         <nav class="sidebar-nav">
             <ul id="sidebarnav">
                 @for(title in menus){