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

modules/themes/alph/README.org

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+#+title: Alph
+#+author: Emmet
+
+"Alph" base-16 theme by me.

modules/themes/alph/default.nix

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+{
+  scheme = "Alph";
+  slug = "alph";
+  author = "LibrePhoenix (https://github.com/librephoenix)";
+  description = "Flagship light theme of the LibrePhoenix Channel";
+  polarity = "light";
+  backgroundUrl = "https://r4.wallpaperflare.com/wallpaper/132/401/75/painting-clouds-sky-landscape-wallpaper-57bfb2f40fd59f8acf4284a1e191c785.jpg";
+  backgroundSha256 = "sha256-ZM0X0IXsUwAgxdZileDOol8kBANxjW8oGrgha3OFjYE=";
+  base00 = "fbfbff";
+  base01 = "D8E4F4";
+  base02 = "BCCDE1";
+  base03 = "9FB4D1";
+  base04 = "667D9F";
+  base05 = "444452";
+  base06 = "333349";
+  base07 = "141229";
+  base08 = "AD0617";
+  base09 = "872626";
+  base0A = "AD6A06";
+  base0B = "06AD72";
+  base0C = "06A3AD";
+  base0D = "0A5D97";
+  base0E = "5B037A";
+  base0F = "87267C";
+}