docs: rearrange showcase

Jacky Zhao

2024-01-26 a8e1c4abc2f5a76d0ff0d582b5c1cbfb81ddbe2f

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$pageWidth: 750px;
$mobileBreakpoint: 600px;
$tabletBreakpoint: 1200px;
$sidePanelWidth: 380px;
$topSpacing: 6rem;
$fullPageWidth: $pageWidth + 2 * $sidePanelWidth;