home: create 'modules/home' folder

Consolidating all modules under the same path, to clear out the
top-level directory.

modules/home/firefox/tridactyl/default.nix

@@ -0,0 +1,28 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.home.firefox.tridactyl;
+
+  term = config.my.home.terminal.program;
+
+  vimCommandLine = {
+    alacritty = ''-e "vim" "%f" "+normal!%lGzv%c|"'';
+    # Termite wants the whole command in a single argument...
+    termite = ''-e "vim %f '+normal!%lGzv%c|'"'';
+  };
+in
+{
+  config = lib.mkIf cfg.enable {
+    xdg.configFile."tridactyl/tridactylrc".source = pkgs.substituteAll {
+      src = ./tridactylrc;
+
+      editorcmd = lib.concatStringsSep " " [
+        # Use my configured terminal
+        term
+        # Make it easy to pick out with a window class name
+        "--class tridactyl_editor"
+        # Open vim with the cursor in the correct position
+        vimCommandLine.${term}
+      ];
+    };
+  };
+}