feat: add create and update contents pages with admin dashboard layout

app/routes/_admin.lg-admin.contents.create.tsx

@@ -0,0 +1,11 @@
+import { AdminDashboardLayout } from '~/layouts/admin/dashboard'
+import { CreateContentsPage } from '~/pages/contents-create'
+
+const DashboardContentsLayout = () => {
+  return (
+    <AdminDashboardLayout>
+      <CreateContentsPage />
+    </AdminDashboardLayout>
+  )
+}
+export default DashboardContentsLayout

app/routes/_admin.lg-admin.contents.update.$id.tsx

@@ -0,0 +1,11 @@
+import { AdminDashboardLayout } from '~/layouts/admin/dashboard'
+import { UpdateContentsPage } from '~/pages/contents-update'
+
+const DashboardContentsLayout = () => {
+  return (
+    <AdminDashboardLayout>
+      <UpdateContentsPage />
+    </AdminDashboardLayout>
+  )
+}
+export default DashboardContentsLayout