Blocked aria-hidden on covers from the home page

[gautierchomel]

From AXE A11Y checker

index_library.html#/home:1 Blocked aria-hidden on an element because its descendant retained focus. The focus must not be hidden from assistive technology users. Avoid using aria-hidden on a focused element or its ancestor. Consider using the inert attribute instead, which will also prevent focus. For more details, see the aria-hidden section of the WAI-ARIA specification at https://w3c.github.io/aria/#aria-hidden.
Element with focus: img
Ancestor with aria-hidden: <img tabindex=​"-1" class=​"cover_img" role=​"presentation" alt aria-hidden=​"true" src=​"store:​/​/​39b7940f-df1a-4e64-a8a9-99d872c2985f/​cover.png">​flex

redundant on each cover image

I guess deleting aria-hidden=​"true" should be a sufficient fix because role=​"presentation" already does the job