[Bug] Large Image - Broken

[sarah-peacock]

Bug description

Image that represents Large Image is not rendering on theme preview page

Expected outcome

Example of large image

Steps to reproduce

Visit theme preview

Technical info

What device were you using when you encountered the bug?

Laptop

What operating system were you using? What version is the operating system?

Macbook Air, 2020

What web browser were you using? What version is the web browser?

Chrome 98.0.4758.80 (Official Build) (x86_64)

Assistive technology and version (optional)

no

Additional information

code points to URL: https://guides.github.com/activities/hello-world/branching.png
this url redirects to "https://docs.github.com/en"

Image - Screenshot

[janbrasna]

This broke in all themes after Docs migration from Help. There's a PR e. g. here pages-themes/hacker#94 but this would need updating in all the themes.