Remove unused import in content-renderer.tsx

The import statement for KeystaticContentRenderer from '@kit/keystatic' in content-renderer.tsx file was removed as it was not being used anywhere in the file. This helps to make the code cleaner and more efficient.

packages/cms/core/src/content-renderer.tsx

@@ -1,5 +1,3 @@
-import { KeystaticContentRenderer } from '@kit/keystatic';
-
 import type { CmsType } from './cms.type';
 
 const CMS_CLIENT = process.env.CMS_CLIENT as CmsType;