Create and use extensions emblem on GitLab and Matrix
Many GNOME apps or libraries have an emblem, consisting of a symbolic icon on a background, that is used for their GitLab page and Matrix room which helps with their branding. It would be nice if both this repo and the Extensions Matrix chat also make use of this emblem style. See GNOME/Initiatives#36 for more info.
Below is an example of how an emblem could look like, based on the color of the Extensions app. When in use, it will be circular or have rounded corners.