Post: Overlay Image with OpenGraph Override

header:
  overlay_image: /assets/images/unsplash-image-1.jpg
  og_image: /assets/images/page-header-og-image.png
  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
  actions:
    - label: "Learn more"
      url: "https://unsplash.com"