refactor!: restructure and document configuration

shared/home-manager/dotfiles/alacritty.nix

@@ -0,0 +1,37 @@
+{ pkgs, ... }:
+
+let
+  catppuccin-theme = pkgs.fetchFromGitHub {
+    owner = "catppuccin";
+    repo = "alacritty";
+    rev = "94800165c13998b600a9da9d29c330de9f28618e";
+    hash = "sha256-Pi1Hicv3wPALGgqurdTzXEzJNx7vVh+8B9tlqhRpR2Y=";
+  };
+in
+{
+  programs.alacritty = {
+    enable = true;
+    settings = {
+      general.import = [ "${catppuccin-theme}/catppuccin-frappe.toml" ];
+
+      font = {
+        normal = {
+          family = "BlexMono Nerd Font";
+          style = "Regular";
+        };
+
+        size = 12;
+      };
+
+      window = {
+        decorations = "None";
+        opacity = 0.8;
+
+        padding = {
+          x = 18;
+          y = 18;
+        };
+      };
+    };
+  };
+}