When the original and new markdown files are located in one of Hugo's content directory
within the https://github.com/istio/istio.io repo. The command will:
Move the original file to the new location (creating any necessary directories along the way).
Update all links to the moved page within the web site to point to the page's new location.
Add an alias entry to the page's front-matter such that any bookmarks set to the old page's
address will continue working and be redirected to the new address automatically.