[docs-infra] Make the Algolia search input label invisible #41542
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I don't think this label existed in the Algolia search input before or I just recently noticed it was visible, even though its class name is
DocSearch-VisuallyHiddenForAccessibility
. I guess we indeed don't want that to be visible as it overlaps with the input's placeholder, but it should still be there for accessibility. So, in this PR, I'm just using the available class to add CSS that will visually hide it, as the class name suggests it should be :)