docs: add GitLab pages CI (#549)

Emil Rofors

2023-11-03 a62a97c7abcabea4509760e5af957eed66fa0755

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