fix: external link icon shouldn't be vertical aligned (#699)

sean

2024-01-16 107d9b8dff59de34a2ebef4b7be942b12f435e3a

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