Style: 디자인 개선 및 toc 추가

Author: lazy-dinosaur

next.config.ts

@@ -1,10 +1,10 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  // output: "export",
+  output: "export",
   images: {
     domains: ["user-images.githubusercontent.com"],
-    formats: ['image/webp'],
+    formats: ["image/webp"],
     // Remove unoptimized: true to enable image optimization
   },
   trailingSlash: true, // ✅ 정적 서버 라우팅 호환성