search for effects

i'll keep this and if the owner wants it i'll submit a PR.
but i really did this to see if i could.

src/effects/Pixelate.js

@@ -74,6 +74,10 @@ export default class Effect {
     return _('Pixelate');
   }
 
+  //this can be used for searching, and helping people find the effect they are looking for
+  static description = "The Pixelate effect transforms the window into a pixelated mosaic, gradually obscuring it by increasing pixel size and randomly hiding pixels until the window fully disappears. This effect offers a playful, retro-inspired transition.";
+
+
   // -------------------------------------------------------------------- API for prefs.js
 
   // This is called by the preferences dialog whenever a new effect profile is loaded. It