Deleted RetroActive Marked SVG src files
Created by: baxysquare
Like the RetroActive and NeoActive themes, I deleted the SVG source files. The source files can now be found at https://github.com/baxysquare/baxy-retroarch-themes/tree/master/retroactive_marked. I also removed the font since RetroActive Marked has been deprecated to be an alternative/replacement icon set for RetroActive, rather than a full-blown theme. I don't plan on doing any more development of this icon set, but it's primed and ready if someone wants to contribute down the line.