FERNVILLE It began as a friendly competition between neighbors on Walnut Street here a few Halloweens ago. When Mark Minter saw Tim Pelton decorating his home with spooky regalia across the street, Minter decided to display a large spider and some paper cobwebs on his own place. “He said, ‘Game on!’ And that was the beginning of it,” said Minter’s wife, Debbie. Today, the