fix: updated hero image

Signed-off-by: Farhaan Bukhsh <farhaan.bukhsh@gmail.com>

Author: farhaanbukhsh

src/_includes/landing/hero-banner.njk

@@ -1,6 +1,6 @@
 <div class="relative w-full h-auto bg-[#4E62F5] -pt-20">
     <img 
-        src="{{ env.baseUrl }}img/hero-banner.jpeg"
+        src="{{ env.baseUrl }}img/hero-banner.png"
         alt="PyCon India 2025"
         class="w-full object-cover object-center"
     />