Icon before article title

Hi everyone! 

I always seem to have a lot of questions. Maybe one day I can actually help someone else out! 

We would like to add an icon before certain articles that show that an article is about a new feature or is updated. We can do that with text or adding an emoji, but I would like to use some of our branding instead. This would require a way to add a jpg, png, etc to the front of an article title. How can I do this? 

See the icon on Twitter below. Thanks!