Stopgap fix for broken feed display images

[howard-e]

Temporary fix for broken feed display example images, until further research is done into packaging the assets together for the Jekyll build system. Inspired by https://github.com/w3c/aria-practices/pull/2705

Related issues:

• https://github.com/w3c/aria-practices/issues/2628
• https://github.com/w3c/wai-aria-practices/issues/190

Link to deploy preview's feed-display example page

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[howard-e]

I've verified this should render the images as expected, when deployed, with a local build of w3c/wai-website.

[mcking65]

Thank you @howard-e!