Refactor page layout in admin accounts component

The layout of the admin accounts component has been refactored. The "Accounts" heading has been removed from the 'admin-accounts-table.tsx' component and placed as a PageHeader in the 'page.tsx'. A description has also been added to the PageHeader, and the content was wrapped in a PageBody component for better structure and readability.

packages/features/admin/src/components/admin-accounts-table.tsx

@@ -100,8 +100,6 @@ function AccountsTableFilters(props: {
 
   return (
     <div className={'flex items-center justify-between space-x-4'}>
-      <Heading level={3}>Accounts</Heading>
-
       <div className={'flex space-x-4'}>
         <Form {...form}>
           <form