Add himalia

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/himalia/users/nick/configs/gui/theme/default.nix

@@ -0,0 +1,11 @@
+{
+  user ? throw "user argument is required",
+  home ? throw "home argument is required",
+}:
+{ ... }:
+{
+  home-manager.users.${user}.theme = {
+    padding = 0;
+    radius = 0;
+  };
+}