docs: simplify oxhugo page

Jacky Zhao

2023-08-26 e3265f841637de197e5cf4a5471372b5178f1e4d

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