fix: generalize frontmatter parsing and coercing

Jacky Zhao

2024-01-28 42ee069c1cc515e6c5e595143e46c8201c6cbe3f

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