feat(design): expose colorable public_api to core's public_api (#2487)

libs/design/src/core/public_api.ts

@@ -1,6 +1,6 @@
 // Core
 export * from './prefix-suffix/public_api';
-export * from './colorable/colorable';
+export * from './colorable/public_api';
 export * from './breakpoints/breakpoints';
 export * from './constructor/constructor';
 export * from './statusable/public_api';