Add original mascot good-idea GIF

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
vor 2 Wochen · 05803f56cc
--- a/public/images/gifs/PostcardMojo_Mascot_Good_Idea_Transparent
+++ b/public/images/gifs/PostcardMojo_Mascot_Good_Idea_Transparent