[Feature] Can you set caption for cover image? #17
Description
I'd like to set the following caption for the cover image
<span style="margin:-20 0 0 0; display:block; text-align: center;"><i><small>Photo by <a href="https://unsplash.com/@birminghammuseumstrust?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Birmingham Museums Trust</a> on <a href="https://unsplash.com/?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Unsplash</a></small></i></span>Here's an example from another theme - https://minimo.netlify.app/docs/cover-image/
---
cover:
image: /images/eden-farm-children-s-village.jpg
alternate: Picture of a yellow wall with a blue window in the upper-left corner
caption: Eden Farm Children's Village by Gareth Harper on Unsplash
style: full
---