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

modules/home/environment/waybar/waybar.nix

@@ -0,0 +1,8 @@
+{pkgs, ...}: {
+  programs.waybar = {
+    enable = true;
+  };
+  programs.waybar.package = pkgs.waybar.overrideAttrs (oa: {
+    mesonFlags = (oa.mesonFlags or []) ++ ["-Dexperimental=true"];
+  });
+}