refactor: translate <RSC> callout component

Author: lumirlumir

src/components/MDX/ExpandableCallout.tsx

@@ -76,7 +76,7 @@ const variantMap = {
       'linear-gradient(rgba(249, 247, 243, 0), rgba(249, 247, 243, 1)',
   },
   rsc: {
-    title: 'React Server Components',
+    title: 'React 서버 컴포넌트',
     Icon: null,
     containerClasses: 'bg-blue-10 dark:bg-blue-60 dark:bg-opacity-20',
     textColor: 'text-blue-50 dark:text-blue-40',