awesome: no gap and border on maximized windows

awesome/.config/awesome/theme_light.lua

@@ -22,6 +22,7 @@ theme.fg_urgent                = "#70675c" -- hsl(34 10% 40%)
 theme.fg_minimize              = "#70675c" -- hsl(34 10% 40%)
 theme.taglist_fg_empty         = theme.fg_minimize
 
+theme.gap_single_client        = false
 theme.useless_gap              = dpi(1)
 theme.border_width             = dpi(2)
 theme.border_normal            = theme.bg_minimize