Image and icon references remain even though media assets are omitted

[RDixon3]

Many Markdown files still contain image and icon references.

Example:
markdown/better-together/using-ham-for-esg.md includes repeated omitted icon references:

![Yes](../../reuse/images/icon-check-mark-green.png)
![No](../../reuse/images/icon-error-red-x.png)