Blog post should use hero image for social preview when available #6378

Expected Behavior

When a blog post is shared on social media, the hero image should be shown if it's available. If it's not available, we can default to the existing social preview image of the Feast architecture.

Current Behavior

At the moment if you share a blog post link on social media, the overall high level preview is shown. Blog posts often have hero images that should be shared instead.\