Post: Overlay Image with OpenGraph Override

This post has a header image with an 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)"
  cta_url: "https://unsplash.com"