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/billing-gateway/package.json

@@ -16,20 +16,20 @@
   "peerDependencies": {
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
-    "zod": "^3.22.4"
-  },
-  "dependencies": {
+    "zod": "^3.22.4",
     "@kit/ui": "0.1.0",
     "@kit/stripe": "0.1.0",
     "@kit/billing": "0.1.0",
     "@kit/supabase": "^0.1.0",
+    "@kit/shared": "^0.1.0",
     "lucide-react": "^0.361.0"
   },
   "devDependencies": {
     "@kit/prettier-config": "0.1.0",
     "@kit/eslint-config": "0.2.0",
     "@kit/tailwind-config": "0.1.0",
-    "@kit/tsconfig": "0.1.0"
+    "@kit/tsconfig": "0.1.0",
+    "@supabase/supabase-js": "^2.39.8"
   },
   "eslintConfig": {
     "root": true,