Remove unused gradient and background utility classes from Tailwind CSS. Update featured_parks.html to handle missing park images and ensure a slug is always present for park links.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 0bdea3fb-49ea-4863-b501-fa6f5af0cbf0
Replit-Commit-Checkpoint-Type: intermediate_checkpoint