Rollup merge of #106462 - notriddle:notriddle/logo-container-sidebar, r=GuillaumeGomez

rustdoc: remove unnecessary wrapper around sidebar and mobile logos

This commit changes `.sidebar a:hover:not(.logo-container)` to add the `:not()` pseudo-class, retaining the old appearance of the logo when mousing over it.

This didn't used to be necessary because the `a.sidebar-logo` was `display:inline`, and was what got the `background` changed on hover, while the `div.logo-container` inside it was `display:block`. This resulted in the hover rule not having any effect, because the logo-container box was not actually nested inside the sidebar-logo box:

https://www.w3.org/TR/CSS2/visuren.html#anonymous-block-level

> When an inline box contains an in-flow block-level box, the inline box (and its inline ancestors within the same line box) are broken around the block-level box (and any block-level siblings that are consecutive or separated only by collapsible whitespace and/or out-of-flow elements), splitting the inline box into two boxes (even if either side is empty), one on each side of the block-level box(es). The line boxes before the break and after the break are enclosed in anonymous block boxes, and the block-level box becomes a sibling of those anonymous boxes. When such an inline box is affected by relative positioning, any resulting translation also affects the block-level box contained in the inline box.

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