Bad link finder

Crawls a mirrored site and checks that all links either return a successful response or redirect to somewhere that does.

Set environment variables:

• MIRROR_DIR, to the location of your mirrored site. Local files will be read in alphabetical order.
• REPORT_OUTPUT_FILE, to the location you'd like the CSV saved to.
• SITE_HOST, to the full host of the live site you'd like to test against, including protocol. For example, https://www.example.com
• START_FROM, optional, specify a file on disk from which to start, e.g. example-folder/example.html. Will check this file and all following files. Useful for restarting aborted runs.

Then execute bad_link_finder.