rohanverma.net/themes/after-dark/layouts/partials/meta/ogimage-maybe.html

<!-- {{/*
  Hack to allow generic site image for Nodes until supported
  by the Hugo internal opengraph template.
*/}}-->
{{ if and (.IsNode) (.Site.Params.images) }}
  <meta property="og:image" content="{{ index .Site.Params.images 0 }}">
{{ end }}
<!-- {{/*
  If specified, fallback to site image if not overriden at Page level
*/}}-->
{{ if and (.IsPage) (not .Params.images) (.Site.Params.images) }}
  <meta property="og:image" content="{{ index .Site.Params.images 0 }}">
{{ end }}