fix(div): update class name to remove weird space afterwards (#763)

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

quartz/components/ArticleTitle.tsx

@@ -1,9 +1,10 @@
 import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
+import { classNames } from "../util/lang"
 
 function ArticleTitle({ fileData, displayClass }: QuartzComponentProps) {
   const title = fileData.frontmatter?.title
   if (title) {
-    return <h1 class={`article-title ${displayClass ?? ""}`}>{title}</h1>
+    return <h1 class={classNames(displayClass, "article-title")}>{title}</h1>
   } else {
     return null
   }