meta: Begin using variables in main configuration

This overall makes it easier to keep track of options we might want to
change (and might be defined in multiple places) without having to worry
about where those places actually are.

common.nix

@@ -1,6 +1,6 @@
 { pkgs, lib, hypr-contrib, nix-gaming, ... }:
 
-{
+let VARIABLES = import ./variables.nix; in {
   imports = [
     ./modules
     ./containers/rar.nix
@@ -34,8 +34,8 @@
   programs.gamemode.enable = true;
 
   environment.systemPackages = with pkgs; [
-    hypr-contrib.packages."x86_64-linux".grimblast
-    nix-gaming.packages."x86_64-linux".osu-stable
+    hypr-contrib.packages."${VARIABLES.system}".grimblast
+    nix-gaming.packages."${VARIABLES.system}".osu-stable
     (pkgs.callPackage ./packages/waycorner { })
     (pkgs.callPackage ./packages/srb2 { })
     slade
@@ -139,7 +139,7 @@
   services.logind.lidSwitch = "ignore";
 
   # timezone
-  time.timeZone = "America/New_York";
+  time.timeZone = "${VARIABLES.timezone}";
 
   # user
   users = {
@@ -163,7 +163,7 @@
 
   # networking
   networking = {
-    hostName = "nixos";
+    hostName = VARIABLES.hostname;
 
     networkmanager = {
       enable = true;