My theme now uses a few of Hugo's internal metadata templates and the convention there is to look for an "images" array in front matter.
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+++ date = "2016-09-07T19:32:36+03:00" title = "No Noise Near the Noisy Mosque" slug = "no-noise-near-noisy-mosque" aliases = ["/2016/09/no-noise-near-the-noisy-mosque/"] author = "Alan Orth" description = "Ironic double standard for noise pollution from our local mosque in Amman." tags = ["Mosque", "Noise", "Amman"] images = ["/2016/09/no-noise-near-mosque.jpg"] +++
{{< figure src="/2016/09/no-noise-near-mosque.jpg" title="Sign forbidding sound near mosque on Rainbow Street, Amman" alt="Sign forbidding sound near mosque on Rainbow Street, Amman" >}}
The irony is rich with this one, because this mosque has a sound system from another planet. If I wasn't worried about my personal safety I'd put up a sign right next to it saying: Please mute your mosque, there is a sleeping Alan 50m away.