Remove extra SSH jump configuration

We now have direct visibility among nodes so we don't need any extra
SSH configuration to reach them.

Reviewed-by: Aleix Boné <abonerib@bsc.es>

m/fox/configuration.nix

@@ -45,16 +45,6 @@
 
   services.fail2ban.enable = true;
 
-  # Use SSH tunnel to reach internal hosts
-  programs.ssh.extraConfig = ''
-    Host bscpm04.bsc.es gitlab-internal.bsc.es tent
-      ProxyJump raccoon
-    Host raccoon
-      ProxyJump apex
-      HostName 127.0.0.1
-      Port 22022
-  '';
-
   networking = {
     timeServers = [ "ntp1.upc.edu" "ntp2.upc.edu" ];
     hostName = "fox";