sanitise_html_email command

Package main demonstrates a HTML email cleaner.

It should be noted that this uses bluemonday to sanitize the HTML but as it preserves the styling of the email this should not be considered a safe or XSS secure approach.

It does function as a basic demonstration of how to take HTML emails, which are notorious for having inconsistent, obselete and poorly formatted HTML, and to use bluemonday to normalise the output.