Rupert: Move everything into hosts/ file

configuration.nix is now just imports.

hosts/Rupert.nix

@@ -17,6 +17,11 @@ in
         # ./open-pgsql.nix
     ];
 
+    boot.loader.systemd-boot.enable = true;
+    boot.loader.efi.canTouchEfiVariables = true;
+
+    networking.hostName = "Rupert";
+
     users.users = {
         waldi = {
             isNormalUser = true;
@@ -110,4 +115,12 @@ in
     services.udev.extraRules = ''
           SUBSYSTEM=="video4linux", ATTRS{idProduct}=="0002", ATTRS{idVendor}=="1d6b", SYMLINK+="hdmi_capture"
     '';
+
+    # This value determines the NixOS release from which the default
+    # settings for stateful data, like file locations and database versions
+    # on your system were taken. It‘s perfectly fine and recommended to leave
+    # this value at the release version of the first install of this system.
+    # Before changing this value read the documentation for this option
+    # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+    system.stateVersion = "22.05"; # Did you read the comment?
 }