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

modules/themes/everforest/README.org

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+#+title: Everforest
+#+author: Emmet
+
+"Everforest" base-16 theme originally by Sainnhe Park ([[https://github.com/sainnhe]]).
+
+[[https://raw.githubusercontent.com/librephoenix/nixos-config-screenshots/main/xmonad/everforest.png]]
+
+[[https://w.wallhaven.cc/full/83/wallhaven-839ppy.png][Background Link]]

modules/themes/everforest/default.nix

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+{
+  scheme = "Everforest";
+  slug = "everforest";
+  author = "Sainnhe Park (https://github.com/sainnhe)";
+  description = "Comfortable & pleasant color scheme (originally for Vim)";
+  polarity = "dark";
+  backgroundUrl = "https://w.wallhaven.cc/full/83/wallhaven-839ppy.png";
+  backgroundSha256 = "sha256-xtnvDoIs+kKvRXo/L+ifq/q+yWNeqh1EUsaRkmDTtz4=";
+  base00 = "2f383e";
+  base01 = "374247";
+  base02 = "4a555b";
+  base03 = "859289";
+  base04 = "9da9a0";
+  base05 = "d3c6aa";
+  base06 = "e4e1cd";
+  base07 = "fdf6e3";
+  base08 = "7fbbb3";
+  base09 = "d699b6";
+  base0A = "dbbc7f";
+  base0B = "83c092";
+  base0C = "e69875";
+  base0D = "a7c080";
+  base0E = "e67e80";
+  base0F = "eaedc8";
+}