Upgrade laptop to NixOS 22.05

base/letsencrypt.nix

 {
   # Let's Encrypt certificate default configuration
   # This enables any service to use a Let's Encrypt certificate
-  security.acme.email = "a+acme@crans.org";
+  security.acme.defaults.email = "a+acme@crans.org";
   security.acme.acceptTerms = true;
 
   # Security hardening

base/nix.nix

@@ -6,7 +6,4 @@
 
   # Restrict nix deamon to wheel group
   nix.allowedUsers = [ "@wheel" ];
-
-  # Use more recent Nix
-  nix.package = pkgs.nix_2_7;  # TODO: remove on NixOS 22.05
 }

services/graphical-desktop.nix

@@ -253,7 +253,9 @@
     };
     programs.chromium = {
       enable = true;
-      package = pkgs.ungoogled-chromium;
+      package = pkgs.ungoogled-chromium.override {
+        commandLineArgs = "--ozone-platform-hint=auto --force-dark-mode --enable-features=WebUIDarkMode --disable-features=UserAgentClientHint -incognito";
+      };
     };
   };
 }