优化目录结构，以及插件

src/assets/main.css

@@ -17,3 +17,24 @@ html, body, #app, .index-container {
 .index-aside .el-menu {
     border-right: 0 none;
 }
+
+.el-menu-left:not(.el-menu--collapse) {
+    width: 250px;
+    min-height: 400px;
+}
+/**
+ * slide-fade 动画
+ */
+.slide-fade-enter-active {
+    transition: all 0.3s ease-out;
+}
+
+.slide-fade-leave-active {
+    transition: all 0.3s cubic-bezier(1, 0.5, 0.8, 1);
+}
+
+.slide-fade-enter-from,
+.slide-fade-leave-to {
+    transform: translateX(20px);
+    opacity: 0;
+}