fix Nexus .NET SDK guide landing page redirect (#4428)

Signed-off-by: Phil Prasek <prasek@gmail.com>

Author: prasek

vercel.json

@@ -1379,11 +1379,6 @@
       "destination": "/develop/dotnet/client/temporal-client",
       "permanent": true
     },
-    {
-      "source": "/develop/dotnet/nexus",
-      "destination": "/develop/dotnet/nexus/feature-guide",
-      "permanent": true
-    },
     {
       "source": "/develop/dotnet/observability",
       "destination": "/develop/dotnet/platform/observability",