upgrade nextjs to 14 (#607)

Author: huozhi

package.json

@@ -15,11 +15,11 @@
     "@vercel/analytics": "^0.1.11",
     "focus-visible": "^5.2.0",
     "intersection-observer": "^0.12.2",
-    "next": "^13.2.4",
-    "nextra": "^2.4.2",
+    "next": "14.2.24",
+    "nextra": "^2.13.4",
     "nextra-theme-docs": "^2.4.2",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
     "react-intersection-observer": "^9.4.3"
   },
   "devDependencies": {
@@ -30,5 +30,6 @@
   "prettier": {
     "embeddedLanguageFormatting": "off",
     "htmlWhitespaceSensitivity": "strict"
-  }
+  },
+  "packageManager": "[email protected]"
 }