home: create 'modules/home' folder

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

modules/home/documentation/default.nix

@@ -0,0 +1,17 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.home.documentation;
+in
+{
+  options.my.home.documentation = with lib; {
+    enable = my.mkDisableOption "documentation integration";
+  };
+
+  # Add documentation for user packages
+  config.programs.man = {
+    enable = cfg.enable;
+    generateCaches = true; # Enables the use of `apropos` etc...
+  };
+
+  config.programs.info.enable = cfg.enable;
+}