refactor(tazjin/nixos): Extract font configuration module

Change-Id: I067d832155db61fb426ea3435e038231f321f71a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5545
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>

users/tazjin/nixos/modules/fonts.nix

@@ -0,0 +1,24 @@
+# Attempt at configuring reasonable font-rendering.
+
+{ pkgs, ... }:
+
+{
+  fonts = {
+    fonts = with pkgs; [
+      corefonts
+      dejavu_fonts
+      jetbrains-mono
+      noto-fonts-cjk
+      noto-fonts-emoji
+    ];
+
+    fontconfig = {
+      hinting.enable = true;
+      subpixel.lcdfilter = "light";
+
+      defaultFonts = {
+        monospace = [ "JetBrains Mono" ];
+      };
+    };
+  };
+}