feat: post header link

package.json

@@ -13,15 +13,17 @@
     "start": "node ./dist/server/entry.mjs"
   },
   "dependencies": {
-    "@astrojs/mdx": "^4.3.4",
     "@astrojs/cloudflare": "^12.6.6",
+    "@astrojs/mdx": "^4.3.4",
     "@tailwindcss/vite": "^4.1.11",
     "astro": "^5.13.4",
     "astro-icon": "^1.1.5",
     "katex": "^0.16.22",
     "lucide-astro": "^0.536.0",
     "lucide-react": "^0.536.0",
+    "rehype-autolink-headings": "^7.1.0",
     "rehype-katex": "^7.0.1",
+    "rehype-slug": "^6.0.0",
     "remark-math": "^6.0.0",
     "serve": "^14.2.4",
     "tailwindcss": "^4.1.11"