docs: add pitch deck link badge to README

Author: edycutjong

README.md

@@ -8,6 +8,7 @@
 
 [![Live Demo](https://img.shields.io/badge/🚀_Live-Demo-06b6d4?style=for-the-badge)](https://civa.edycu.dev)
 [![Pitch Video](https://img.shields.io/badge/🎬_Pitch-Video-ef4444?style=for-the-badge)](https://youtube.com/watch?v=DEMO_VIDEO)
+[![Pitch Deck](https://img.shields.io/badge/📊_Pitch-Deck-f59e0b?style=for-the-badge)](public/pitch/index.html)
 [![Built for Frontier](https://img.shields.io/badge/Colosseum-Frontier_Hackathon-8b5cf6?style=for-the-badge)](https://superteam.fun/earn/listing/100xdevs-frontier-hackathon-track)
 
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