Remove lead post from rich text body if featured image is being used

[bdivver]

No need for duplicate images

[jwcounts]

Finally got some time to look at this, and I think I've found a different way to remove the image. Instead of running a regex on the computed layout, I modified get_body_with_layout() to ignore images that are tagged as 'primary' when the dp_npr_query_use_featured option is set to 'true'.

I'm including your updates in the settings.php file, though I did add a check to disable the "theme uses featured images" checkbox if "use layout" is not enabled.