Templates: remove shared.nix

- user-password is now part of the new 'users' module (https://docs.clan.lol/reference/clanServices/users/)
- setting 'users.users.user' is not needed and also part of the 'users' module
- services.avahi.enable = true; is not strictly needed can become part of an mdns guide, but shouldnt be part of the default template

templates/clan/default/modules/shared.nix

@@ -1,27 +0,0 @@
-{
-  clan-core,
-  # Optional, if you want to access other flakes:
-  # self,
-  ...
-}:
-{
-  imports = [
-    clan-core.clanModules.user-password
-  ];
-
-  # Locale service discovery and mDNS
-  services.avahi.enable = true;
-
-  # generate a random password for our user below
-  # can be read using `clan secrets get <machine-name>-user-password` command
-  clan.user-password.user = "user";
-  users.users.user = {
-    isNormalUser = true;
-    extraGroups = [
-      "wheel"
-      "networkmanager"
-      "video"
-      "input"
-    ];
-  };
-}