Document redirection link

[dp1218]

The redirection may be broken if the javascript of the page cannot be executed because of a middleware or if the browser of the client disabled it. Also note that the meta redirect is set as deprecated by the W3C.

With those conditions, the human may land on a page which is in fact a dead end because no information is provided to tell him what should have happened.

This PR provides a link to click to follow manually the redirection.