chore(deps): update dependency nuxt to v4

Author: renovate[bot]

docs/package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@nuxt/content-theme-docs": "^0.8.2",
-    "nuxt": "^2.14.12"
+    "nuxt": "^4.2.1"
   },
   "devDependencies": {
     "nuxt-ackee": "^2.0.0"