Update dependency nuxt to v3 [SECURITY]

Author: renovate[bot]

ui/package.json

@@ -30,7 +30,7 @@
     "markdown-it-emoji": "^1.4.0",
     "markdown-it-footnote": "^3.0.2",
     "markdown-it-sanitizer": "^0.4.3",
-    "nuxt": "^2.0.0",
+    "nuxt": "^3.0.0",
     "push.js": "^1.0.12",
     "vue-clipboard2": "^0.3.1",
     "vue-underscore": "^0.1.4"