Option to hide Alt text by default when viewing media

[DukeOFprunesOriginal]

Pitch

Alt text size is very generous. Many videos or animated gifs start playing behind a wall of it. Alt text should optionally be hidden by default for those who do not wish to see it

Motivation

Everyone. It's fine to keep it on by default dor accessibility but not everyone wants or needs to see it for every image or video they view

[connyduck]

I don't like adding more options. Instead we should think about a better layout where one can (for example) easily swipe the text in or out of view.