I apologize, but it seems that the README file provided is empty and does not contain any content. As a result, I am unable to create a summary passage about the plugin.

If you could provide me with the actual contents of the README file, I would be happy to assist you in creating a short passage (100 words or less) about the plugin's features and benefits for your blog.

Easily adjust header levels in Markdown documents by increasing or decreasing their levels. Supports full document adjustments or specified line ranges, with default settings and commands for convenience.