template: no GPU driver setup, Home Manager news silent

targets.genericLinux.gpu would ask for a root setup (a tmpfiles.d link
under /etc) for drivers that Nix-built GUI apps need and steam-frame-nix
doesn't; news.display = "silent" drops the unread news notice on each
switch (home-manager news still lists them).

README.md

@@ -195,6 +195,7 @@ these two files ([`template/`](template), with more comments):
   home.homeDirectory = homeDirectory;
   home.stateVersion = "26.05";
   targets.genericLinux.enable = true;
+  targets.genericLinux.gpu.enable = false;  # no GPU drivers for Nix GUI apps (their setup is a root service)
   programs.home-manager.enable = true;
   programs.git = {                    # SteamOS's git, Home Manager writes its config
     enable = true;

template/home.nix

@@ -7,7 +7,11 @@
   home.stateVersion = "26.05";
 
   targets.genericLinux.enable = true;  # non-NixOS integration
+  # Nix-built GUI apps without GPU drivers; steam-frame-nix doesn't need
+  # them and the setup would write a root service under /etc:
+  targets.genericLinux.gpu.enable = false;
   programs.home-manager.enable = true; # the `home-manager` command
+  news.display = "silent";             # `home-manager news` lists them
 
   # git credentials for HTTPS (`install.sh install --clone` uses them):
   # github.com through the GitHub CLI (gh auth login), other hosts from