Update nav.json

enterprise link back again

Author: 4lb

src/data/nav.json

@@ -22,6 +22,12 @@
     "url": "/compare/",
     "prefetch": true
   },
+  {
+    "display": "Enterprise",
+    "url": "https://docs.defguard.net/enterprise/enterprise-features",
+    "prefetch": false,
+    "external": true
+  },
   {
     "display": "Pricing",
     "url": "/pricing/",