Add Hyprland and Niri configuration files

- Introduced `binds.nix` for Hyprland, defining keybindings for various applications and workspace management.
- Added `base-settings.nix` and `window-rules.nix` for Niri, establishing keyboard input settings and window management rules.
- Updated `default.nix` for both Hyprland and Niri to import new configuration files, enhancing modularity and maintainability.

modules/desktop/niri/base-settings.nix

@@ -0,0 +1,18 @@
+{ self, ... }: {
+  flake.lib.niriBaseSettings =
+    pkgs:
+    {
+      input.keyboard = {
+        xkb.layout = "ca";
+        xkb.variant = "";
+      };
+      input."focus-follows-mouse" = _: {
+        props."max-scroll-amount" = "45%";
+        content = { };
+      };
+      input."warp-mouse-to-focus" = _: { };
+      layout.gaps = 5;
+      prefer-no-csd = true;
+      window-rules = self.lib.niriWindowRules;
+    };
+}