refactor: remove unused audience images and add Media Kit page route

- Deleted 8 audience images from public/images/audience/ directory (1.jpg through 8.jpg)
- Deleted 8 audience images from public/images/audiences/ directory (1.jpg through 8.jpg)
- Added lazy-loaded MediaPage route at /mediakit path in App.tsx
- Added Media Kit navigation link to Footer component with hover styling

public/images/mediakit/logo_dark/logomark.svg

@@ -0,0 +1 @@
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