Refactored file structure to make more sense, made default.nixes less verbose

modules/home/environment/waybar/default.nix

@@ -0,0 +1,6 @@
+{...}: {
+  imports =
+    [(import ./waybar.nix)]
+    ++ [(import ./settings.nix)]
+    ++ [(import ./style.nix)];
+}