feat: add yolo host

New NixOS VM on proxmox, replacing the Ubuntu box. Reuses the existing
Hyprland config; remote access is Sunshine/Moonlight rather than xrdp,
since xrdp cannot drive a wayland compositor.

Two fixes here are not yolo-specific and affect any fresh install:
git at system level (nix needs it for the type = "git" hyprland input,
but git only came from home-manager, so neither rebuild could run), and
dropping the yogurt input, whose private repo made home-manager
un-evaluatable without GitHub auth.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

home/common/programs/hyprland/default.nix

@@ -154,7 +154,6 @@ in
           hl.exec_cmd("hyprctl setcursor Nordzy-cursors ${toString cfg.cursorSize}")
           hl.exec_cmd("hyprsunset")
           hl.exec_cmd("noctalia")
-          hl.exec_cmd("yogurt --tray")
         end)
 
         -- layer rules