additional colors under admin control

src/app/services/station-config.service.ts

@@ -46,6 +46,10 @@ const DEFAULT_CONFIG: StationConfig = {
   color_success: '#4a9e4f',
   color_danger: '#c83030',
   color_info: '#3a8abf',
+  color_white: '#ffffff',
+  color_light: '#f0ebe3',
+  color_medium: '#8a8580',
+  color_black: '#1a1816',
 };
 
 @Injectable({