chore(deps): update nextra monorepo to v3

Author: renovate[bot]

packages/website/package.json

@@ -22,8 +22,8 @@
     "clsx": "2.1.1",
     "next": "14.2.14",
     "next-themes": "0.3.0",
-    "nextra": "2.13.4",
-    "nextra-theme-docs": "2.13.4",
+    "nextra": "3.0.3",
+    "nextra-theme-docs": "3.0.3",
     "postcss": "8.4.47",
     "postcss-lightningcss": "1.0.1",
     "react": "18.3.1",