feat: implement logout functionality in admin navbar and update sidebar links

app/routes/actions.admin.logout.ts

@@ -0,0 +1,22 @@
+import { data } from 'react-router'
+
+import { setStaffLogoutHeaders } from '~/libs/logout-header.server'
+
+export const action = async () => {
+  try {
+    const responseHeaders = setStaffLogoutHeaders()
+
+    return data(
+      { success: true },
+      { headers: responseHeaders, status: 200, statusText: 'OK' },
+    )
+  } catch {
+    return data(
+      {
+        message: 'Something went wrong',
+        success: false,
+      },
+      { status: 500 },
+    )
+  }
+}