YouTube exit links

[TPS]

@svenjacobs YouTube uses a similar, but not identical scheme, to #42. E.g., on Google's own About page to About Google, YT gives

• https://www.youtube.com/redirect?event=channel_description&redir_token=QUFFLUhqa1JoZzZUczlhMWJCaTBoc1lqa3ZtX2Rpd0ZPUXxBQ3Jtc0tsYVhpenF1czV5VjlwZm5pemZGdm4zNHVXSldEUlR6dHNhZzI0UkFvLXo0cEVyUk0yaHR5LVhGWEFCLVdzdmlZWGU3eUY5ZWdUZTBUbEw3MVg4UDZCRzdkXzdaaGczT25Ka3Q5bjUzTmxWVHF3Tll6MA&q=http%3A%2F%2Fwww.google.com%2Fabout%2F&html_redirect=1

which, of course, should just be

• http://www.google.com/about/

(Oops, Google forgot httpS?! 🤣 I digress.…)

So just the url-decoded value of parameter q? This would work great in conjunction w/ #55.