feat: implement admin dashboard layout and update authentication flow

app/layouts/admin/dashboard.tsx

@@ -0,0 +1,14 @@
+import type { PropsWithChildren } from 'react'
+
+export const AdminDashboardLayout = (properties: PropsWithChildren) => {
+  const { children } = properties
+  return (
+    <div className="grid">
+      <div>Navbar</div>
+      <div className="flex">
+        <div>Sidebar</div>
+        <div>{children}</div>
+      </div>
+    </div>
+  )
+}