Website's "add trailing slash" trick is partly broken
https://tails.boum.org/news/version_3.11 does not redirect to
https://tails.boum.org/news/version_3.11/ so included images (whose
./$image.png) are broken. Thankfully, only URLs cooked
somewhat manually or clicked from recentchanges and maybe a few other
places are affected: I thik URLs we display to the vast majority of
users work fine.
It might be that the way this trick was implemented can’t work when a directory of the same name as the page exists, which is necessary the case when we add attachments to said page.