feat(post) add header, fix style

frontend/package.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "@nextui-org/react": "^2.3.5",
+    "@types/react-syntax-highlighter": "^15.5.13",
     "axios": "^1.6.8",
     "framer-motion": "^11.2.10",
     "lxgw-wenkai-webfont": "^1.7.0",
@@ -19,7 +20,7 @@
     "react-dom": "^18",
     "react-icons": "^5.1.0",
     "react-markdown": "^9.0.1",
-    "rehype-highlight": "^7.0.0",
+    "react-syntax-highlighter": "^15.5.0",
     "rehype-raw": "^7.0.0",
     "rehype-sanitize": "^6.0.0",
     "remark-frontmatter": "^5.0.0",