Add flake input for naviterm

flake.nix

@@ -38,6 +38,11 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
+    naviterm = {
+      url = "gitlab:detoxify92/naviterm";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
     pppdotpm-site = {
       url = "git+ssh://gitea@git.ppp.pm:1122/alex/ppp.pm-site.git?ref=main";
       inputs.nixpkgs.follows = "nixpkgs";