Add niri module

- An overridden `niri.service` is provided, so that systemd does not take
over autostart and try to start things *before* we have an XWayland server running.
- Somehow `wlsunset` is still not working, might need some investigation into why.

home/kagami-pc-home.nix

@@ -39,6 +39,7 @@
   linux.graphical.wallpaper = ./images/pixiv_18776904.png;
   linux.graphical.defaults.webBrowser.package = pkgs.zen-browser-bin;
   linux.graphical.defaults.webBrowser.desktopFile = "zen.desktop";
+  programs.my-niri.enable = true;
   programs.my-sway.enable = true;
   programs.my-sway.fontSize = 15.0;
   programs.my-sway.enableLaptop = true;