EPK: Reduce image sizes for faster load times

[magent-cryptograss]

The EPK is currently ~30MB, almost entirely images:

• Posters: 23MB (9 files, several are 2-8MB PNGs)
• Other images: 7MB (gallery, hero, thumbnails)

Suggestions:

• Convert large PNGs to JPEG or WebP (especially SCHELLINGPOINTRC4.png at 8.7MB)
• Resize posters to reasonable display dimensions (most are shown as thumbnails)
• Add responsive image sizes (srcset) for different screen widths
• Consider lazy loading for below-the-fold images

This would significantly improve load times, especially on mobile.