feat: External link icons (#697)

sean

2024-01-16 fa7d139ce5a0216ca3f6e63c78f818e9c028a3ab

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