Add admin dashboard data loading & package dependencies

Removed 'admin-header.tsx' and 'admin-sidebar.tsx' components and added 'admin-dashboard.loader.ts' to handle loading data for the admin dashboard. Updated 'admin-dashboard.tsx' and 'page.tsx' to use this loader. Package dependencies were also updated in 'pnpm-lock.yaml' and 'package.json' files of relevant packages. This commit prioritizes loading dashboard data effectively and managing package dependencies.

packages/billing/gateway/package.json

@@ -14,6 +14,7 @@
     "./components": "./src/components/index.ts"
   },
   "peerDependencies": {
+    "@hookform/resolvers": "3.3.4",
     "@kit/billing": "0.1.0",
     "@kit/shared": "^0.1.0",
     "@kit/stripe": "0.1.0",
@@ -24,6 +25,7 @@
     "zod": "^3.22.4"
   },
   "devDependencies": {
+    "@hookform/resolvers": "^3.3.4",
     "@kit/billing": "workspace:^",
     "@kit/eslint-config": "workspace:*",
     "@kit/lemon-squeezy": "workspace:^",