Fix a bug where it failed to add a new line in the end (#123)

Author: liu-cong

remote-content/remote-sources/utils.js

@@ -152,10 +152,10 @@ sidebar_position: ${sidebarPosition}
   const transformedContent = contentTransform ? contentTransform(content, filename) : content;
 
   // Ensure content ends with a newline before adding the callout
-  const contentWithNewline = transformedContent.endsWith('\n') ? transformedContent : transformedContent + '\n';
+  const contentWithNewline = transformedContent + '\n';
 
   return {
     filename: newFilename,
     content: frontmatter + contentWithNewline + sourceCallout
   };
-} 
+}