treewide: yet another restructure

modules, overlays, and packages have their own default.nix re-exporting
things instead of reading file paths. slightly improves declarativeness.

wine-osu is removed; we're just using nix-gaming (for now).

our custom packages will now have to be accessed via pkgs.me instead of
just pkgs. helps know where it came from

future goals: get rid of our overlays completely, or at least not make
it replace anything from nixpkgs

modules/default.nix

@@ -0,0 +1,51 @@
+{ lib }:
+let
+  getName = path: lib.removeSuffix ".nix" ( # Strip extension
+    lib.last (                              # Gets the last part (filename)
+      lib.splitString "/" (                 # Splits the path into components
+        builtins.toString path              # Converts the path into a string
+      )
+    )
+  );
+  mkAttrsFromPaths = paths: builtins.listToAttrs (
+    builtins.map (path: {
+      name = getName path;
+      value = path;
+    }) paths
+  );
+in {
+  system = mkAttrsFromPaths [
+    ./system/audio.nix
+    ./system/base.nix
+    ./system/gui.nix
+    ./system/input.nix
+    ./system/kernel.nix
+    ./system/nix.nix
+    ./system/packages.nix
+    ./system/security.nix
+    ./system/snapper.nix
+    ./system/transmission.nix
+    ./system/wireguard.nix
+  ];
+  user = mkAttrsFromPaths [
+    ./user/bspwm.nix
+    ./user/direnv.nix
+    ./user/dunst.nix
+    ./user/git.nix
+    ./user/gpg.nix
+    ./user/kitty.nix
+    ./user/mpv.nix
+    ./user/neovim.nix
+    ./user/npm.nix
+    ./user/packages-rin.nix
+    ./user/picom.nix
+    ./user/polybar.nix
+    ./user/rofi.nix
+    ./user/sessionVariables.nix
+    ./user/sxhkd.nix
+    ./user/theming.nix
+    ./user/xdg.nix
+    ./user/xorg.nix
+    ./user/zsh.nix
+  ];
+}