docs: improve first-time git setup

Jacky Zhao

2024-01-28 bf5a556cc15edd311cf5cb7faab2509569e6af0a

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