refactor: 暗黑模式自定义样式调整

Former-commit-id: 3857806786944e41c688cb6e81a5d90276720e2a

src/styles/dark.scss

@@ -1,12 +1,3 @@
-// only scss variables
-
-$--colors: (
-  "primary": ("base": red),
-);
-
-@forward "element-plus/theme-chalk/src/dark/var.scss" with ($colors: $--colors);
-
-
 html.dark {
   .navbar {
     background-color: var(--el-bg-color);
@@ -16,4 +7,7 @@ html.dark {
   .hamburger {
     fill: var(--el-text-color-regular);
   }
-}
+
+
+
+}