remove gitea service (has not worked at all)

modules/gitea.nix

@@ -1,13 +0,0 @@
-{ pkgs, ... }:
-{
-    environment.systemPackages = with pkgs; [
-	  gitea
-          tea
-    ];
-    services.gitea.enable = true;
-    
-    #erreichbar unter https://bfds:3000/
-    services.gitea.settings.server.ROOT_URL = "/";
-    services.gitea.settings.server.DOMAIN = "bfds";
-    services.gitea.database.type = "sqlite3";
-}