Maybe the Broncos’ recent loss to the St. Louis Rams was the final blow. Or maybe Denver diners don’t like pizza with a crust like a giant Saltine. For whatever reason, St. Louis-style pizza just never took off here. And now all three Arch Pizza locations that had opened over the past year have closed. The phone message at the Lone Tree location says the store is “currently under construction” — and it must be some wild project, because the mini-chain’s website, archpizzaco.com, now leads directly to a Viagra/Cialis site.