chore(deps): update devdependency nuxt to ^3.19.0 [security]

Author: renovate[bot]

docs/package.json

@@ -16,6 +16,6 @@
     "@nuxtjs/plausible": "^2.0.1",
     "@types/node": "^24.7.0",
     "eslint": "^9.37.0",
-    "nuxt": "^4.1.3"
+    "nuxt": "^3.19.0"
   }
 }