fix: add missing Skeleton component export

Author: tmaciej-neti

src/index.ts

@@ -3,4 +3,5 @@ export * from "@/components/card";
 export * from "@/components/form";
 export * from "@/components/input";
 export * from "@/components/label";
+export * from "@/components/skeleton";
 export { cn } from "@/lib/utils";