WASHINGTON — House Democrats opened their first day of arguments in former President Donald Trump’s impeachment trial with searing footage of the U.S. Capitol riot as they painted Trump as an “inciter in chief” who systematically riled up his supporters and falsely convinced them the election had been stolen, culminating in the deadly attack.“He assembled, inflamed and incited his followers to descend upon the Capitol,” the lead impeachment manager, Rep. Jamie Raskin, D-Md., said Wednesday.As she presented harrowing …