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

modules/themes/darkmoss/README.org

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+#+title: Darkmoss
+#+author: Emmet
+
+"Darkmoss" base-16 theme originally by Gabriel Avanzi ([[https://github.com/avanzzzi]]).
+
+[[https://raw.githubusercontent.com/librephoenix/nixos-config-screenshots/main/xmonad/darkmoss.png]]
+
+[[https://w.wallhaven.cc/full/0w/wallhaven-0wrp3p.jpg][Background Link]]

modules/themes/darkmoss/default.nix

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+{
+  scheme = "darkmoss";
+  slug = "darkmoss";
+  author = "Gabriel Avanzi (https://github.com/avanzzzi)";
+  description = "A dark color scheme for Base16";
+  polarity = "dark";
+  backgroundUrl = "https://w.wallhaven.cc/full/0w/wallhaven-0wrp3p.jpg";
+  backgroundSha256 = "sha256-JGEY8mhpXNLCXPoWCXvGWbLkfkpeZRl+hxiLPGwVmSQ=";
+  base00 = "171e1f";
+  base01 = "252c2d";
+  base02 = "373c3d";
+  base03 = "555e5f";
+  base04 = "818f80";
+  base05 = "c7c7a5";
+  base06 = "e3e3c8";
+  base07 = "e1eaef";
+  base08 = "ff4658";
+  base09 = "e6db74";
+  base0A = "fdb11f";
+  base0B = "499180";
+  base0C = "66d9ef";
+  base0D = "498091";
+  base0E = "9bc0c8";
+  base0F = "d27b53";
+}