docs: make setting upstream more clear, docs on npx quartz restore

Jacky Zhao

2023-08-20 d205eb568686a718cae889d51fde5ae18d352b30

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$pageWidth: 750px;
$mobileBreakpoint: 600px;
$tabletBreakpoint: 1200px;
$sidePanelWidth: 400px;
$topSpacing: 6rem;
$fullPageWidth: $pageWidth + 2 * $sidePanelWidth;