ATL rap veteran Ludacris demonstrated his special relationship with St. Louis when he took the stage under the Arch as part of the entertainment lineup for Celebrate 250 Friday night. He was among the opening night artists of a weekend celebration presented by Celebrate Saint Louis that included several of the biggest names in music from hip hop, reggae, pop, country and EDM. “Three cities supported me from day one,” Luda said. “St. Louis was o…