We have references to users throughout the UI, which sometimes are

accompanied by an avatar and sometimes badges. We don't really have a

standard way of displaying these, and some in-progress work's about to

be affected by that once again.
This change introduces a new rb-c-user CSS component, a dedicated

template file for generating it, and a Storybook file for viewing it.
The component standardizes the layout needed to get proper alignment for

the user, avatar, and badges, helping it fit in elsewhere.
Existing call sites have been updated to use the new component.

Tested all uses throughout the UI, making sure content was aligned and

spaced out correctly.
Tested all options in Storybook.