[Accessibility] Add tooltip to `MinimalFooter` icons
There was a recent accessibility audit for https://githubuniverse.com.
Expected result On the footer section, the tooltips should be defined for the twitter, github, linkedin, youtube and facebook controls.
The MinimalFooter component currently has the visually-hidden text for screen readers. But I assume we would also need something for mouse and keyboard users that might not know what the icon (e.g. twitter bird) means. In the audit it says adding a "tooltip", but not sure if it needs to be a Tooltip like we have in Primer React? It's still marked as "Not reviewed for accessibility". Or if adding a title attribute that the browser shows as a tooltip would be enough? Maybe something to get clarity with the #accessibility team first.
Discussed with a11y working group at the Accessibility Eng+ Office Hour. This is no longer considered a WCAG failure. We will follow up with this when Primer implements its Tooltip component (currently deferred to Q2).
Closing this as it's not been raised in any recent audits. If it's still relevant, feel free to re-open.