feat(murmur): Add Mumble server

hosts/deertopia/configuration.nix

@@ -50,6 +50,7 @@
       syncthing.enable = true;
       cache.enable = true;
       mullvad.enable = true;
+      murmur.enable = true;
       servarr = {
         enable = true;
         prowlarr.enable = true;