Remove billing and checkout redirect buttons and related services

Deleted the billing-redirect-button, checkout-redirect-button, and embedded-stripe-checkout components. Additionally, removed the shadcn directory, which encompassed billing-related icons. This change streamlines the subscription settings interface and organizes the system's payment management. This update is a stepping stone towards improving the billing system's overall architecture.

packages/ui/src/shadcn/separator.tsx

@@ -1,31 +1,32 @@
-"use client"
+'use client';
 
-import * as React from "react"
-import * as SeparatorPrimitive from "@radix-ui/react-separator"
+import * as React from 'react';
 
-import { cn } from "@kit/ui/utils"
+import * as SeparatorPrimitive from '@radix-ui/react-separator';
+
+import { cn } from '@kit/ui/utils';
 
 const Separator = React.forwardRef<
   React.ElementRef<typeof SeparatorPrimitive.Root>,
   React.ComponentPropsWithoutRef<typeof SeparatorPrimitive.Root>
 >(
   (
-    { className, orientation = "horizontal", decorative = true, ...props },
-    ref
+    { className, orientation = 'horizontal', decorative = true, ...props },
+    ref,
   ) => (
     <SeparatorPrimitive.Root
       ref={ref}
       decorative={decorative}
       orientation={orientation}
       className={cn(
-        "shrink-0 bg-border",
-        orientation === "horizontal" ? "h-[1px] w-full" : "h-full w-[1px]",
-        className
+        'shrink-0 bg-border',
+        orientation === 'horizontal' ? 'h-[1px] w-full' : 'h-full w-[1px]',
+        className,
       )}
       {...props}
     />
-  )
-)
-Separator.displayName = SeparatorPrimitive.Root.displayName
+  ),
+);
+Separator.displayName = SeparatorPrimitive.Root.displayName;
 
-export { Separator }
+export { Separator };