add spectacle config, add spotify, fix cinny video playback with gstreamer

refactor some stuff to look nicer and have more structure too

modules/home/desktop/spectacle/default.nix

@@ -0,0 +1,24 @@
+{
+  config,
+  lib,
+  namespace,
+  ...
+}:
+with lib;
+with lib.${namespace};
+let
+  cfg = config.${namespace}.desktop.spectacle;
+in
+{
+  options.${namespace}.desktop.spectacle = with types; {
+    enable = mkBoolOpt false "Whether or not to enable spectacle config.";
+  };
+
+  config = mkIf cfg.enable {
+    programs.plasma = {
+      enable = true;
+      spectacle.shortcuts.captureRectangularRegion = "Meta+Shift+S";
+    };
+  };
+
+}