Replace the cartoon-style OG image with a clean, text-based design
inspired by VocaMac's approach:
- Left side: Logo, tagline, feature bullets, GitHub CTA, distro pills
- Right side: Feature cards with SVG icons and colored badges
- Proper SVG vector icons (shield, keyboard, lightning, microphone)
- Brand gradient accent lines top and bottom
- Added SVG source file for future edits
Image size reduced from 1.1MB to 113KB (PNG) and 96KB to 41KB (webp).
Swap the website Open Graph image with the provided design and regenerate both PNG and WebP assets at the standard 1200x630 share size so previews render consistently across platforms.