Update Markdown File Index

The update-markdown-file-index skill scans a specified folder, discovers files matching a given pattern, and automatically updates or creates an index section in a markdown file with a formatted table or list of those files. It's designed for documentation maintainers and repository managers who need to keep markdown indexes current without manual updates, solving the problem of outdated file listings and broken or missing documentation references. The skill preserves existing markdown structure, generates appropriate formatting based on content type, and ensures all file links use relative paths for repository consistency.