PHOTO BY KRISTY GRAVER After months of late-night renovations, it’s a brand new day for Mad Mex in Shadyside. The flagship site in big Burrito Restaurant Group’s “Funky Fresh Cal-Mex” chain has been given a refresh inside, out and on the menu. PHOTO BY KRISTY GRAVER Through Mad Mex Sol, the company is breathing new life into its first concept, which debuted in 1993 at a small space in Oakland that closed in 2023. There are currently nine Mad Mex…