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

modules/themes/ubuntu/README.org

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+#+title: Ubuntu
+#+author: Emmet
+
+"Ubuntu" base-16 theme based on the official Ubuntu color palette ([[https://design.ubuntu.com/brand/colour-palette]]) and packaged by me ([[https://gitlab.com/librephoenix]]).
+
+[[https://raw.githubusercontent.com/librephoenix/nixos-config-screenshots/main/xmonad/ubuntu.png]]
+
+[[https://images.hdqwalls.com/download/sea-of-dreamscape-r4-1920x1080.jpg][Background Link]]

modules/themes/ubuntu/default.nix

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+{
+  scheme = "Ubuntu";
+  slug = "ubuntu";
+  author = "Based on https://design.ubuntu.com/brand/colour-palette, adapted to base16 by librephoenix (https://github.com/librephoenix)";;
+  description = "Orange and purple color scheme based on the Ubuntu brand colors";
+  polarity = "dark";
+  backgroundUrl = "https://images.hdqwalls.com/download/sea-of-dreamscape-r4-1920x1080.jpg";
+  backgroundSha256 = "sha256-5TPwZAQekK1Aq2YdomcJ0irGmIXVPUpgxRwuEetthYw=";
+  base00 = "2C001E";
+  base01 = "411934";
+  base02 = "56334B";
+  base03 = "6B4C61";
+  base04 = "806678";
+  base05 = "957F8E";
+  base06 = "DFE2E5";
+  base07 = "A08C99";
+  base08 = "E95420";
+  base09 = "F7C3B1";
+  base0A = "AEC795";
+  base0B = "95C7A4";
+  base0C = "95AEA1";
+  base0D = "772953";
+  base0E = "7E4770";
+  base0F = "C79595";
+}