refactor: restructure config files

modules/capabilities/clipboard.nix

@@ -0,0 +1,10 @@
+{
+  flake.modules.homeManager.clipboard =
+    { pkgs, ... }:
+    {
+      home.packages = [ pkgs.wl-clipboard ];
+
+      services.cliphist.enable = true;
+      services.wl-clip-persist.enable = true;
+    };
+}