Revert React Conf 2024 banner

[Abbondanzo]

React Conf has sadly ended. Time to revert #4066

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[cortinico]

True, but I'd keep in sync with react.dev (which haven't removed the banner just yet)

[Abbondanzo]

True, but I'd keep in sync with react.dev (which haven't removed the banner just yet)

Added a PR to revert the banner on react.dev too: reactjs/react.dev#6891

[Abbondanzo]

@cortinico react.dev has removed their banner altogether. I can modify this PR to do the same but it'd be nice to keep the old banner if possible

[cortinico]

react.dev has removed their banner altogether. I can modify this PR to do the same but it'd be nice to keep the old banner if possible

I'd rather keep the two website in sync so let's just remove the banner and follow react.dev