fix: 修正section-4背景图URL引号格式

public/themes/website/1/zh/demo/single_index.html

@@ -1392,7 +1392,7 @@
             <section class="section-4 section__wrap" data-header-dark>
                 <div
                     class="section-4__bg"
-                    style="background-image: url("/themes/dist_static/static/images/section-4-bg-C4HH-tmQ.png")"
+                    style="background-image: url('/themes/dist_static/static/images/section-4-bg-C4HH-tmQ.png')"
                 ></div>
                 <div class="section__inner section-4__inner">
                     <div class="section-4__visual">