Major config overhaul: use custom modules, setup for multi-host config, and less boilerplate

modules/themes/ashes/README.org

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+#+title: Ashes
+#+author: Emmet
+
+"Ashes" base-16 theme originally by Jannik Siebert ([[https://github.com/janniks]]).
+
+[[https://raw.githubusercontent.com/librephoenix/nixos-config-screenshots/main/xmonad/ashes.png]]
+
+[[https://images.hdqwalls.com/wallpapers/anime-road-to-city-everlasting-summer-4k-ep.jpg][Background Link]]

modules/themes/ashes/default.nix

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+{
+  scheme = "Ashes";
+  slug = "ashes";
+  author = "Jannik Siebert (https://github.com/janniks)";
+  description = "Desaturated dark color scheme";
+  polarity = "dark";
+  backgroundUrl = "https://images.hdqwalls.com/wallpapers/anime-road-to-city-everlasting-summer-4k-ep.jpg";
+  backgroundSha256 = "sha256-ul7ecqPw9bSr+JRSd+3OlKwVfB+5378L7ObYydJDsgQ=";
+  base00 = "1C2023";
+  base01 = "393F45";
+  base02 = "565E65";
+  base03 = "747C84";
+  base04 = "ADB3BA";
+  base05 = "C7CCD1";
+  base06 = "DFE2E5";
+  base07 = "F3F4F5";
+  base08 = "C7AE95";
+  base09 = "C7C795";
+  base0A = "AEC795";
+  base0B = "95C7AE";
+  base0C = "95AEC7";
+  base0D = "AE95C7";
+  base0E = "C795AE";
+  base0F = "C79595";
+}