Revert contentIndex to RSS 2.0 (#407)

bfahrenfort

2023-08-24 8200c8d0402cb40e9f65c49dac5be621360a3a20

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