Add lingering, remove kill on exit, fix smallfetch, replace tmux with zellij

modules/system/users/main/default.nix

@@ -10,6 +10,7 @@
     users.users."${config.sysusers.main}" = {
       isNormalUser = true;
       createHome = true;
+      linger = true;
       hashedPassword = config.secrets.accPass.main;
       openssh.authorizedKeys.keyFiles = [
         ../../../../hosts/tower/id_ed25519.pub