header icon sizing/svg?

This is in branch add-header-styles
Currently all icons in solid-ui are in the icon directory as svg files, however in mashlib the icon for the header sits in a icon.ts file. I think I should make this a svg file called header-icon.svg and store it in the icon directory to match the organization of solid-ui, since it will now be in that repository. Want to get feedback?

The other thing I have ran into is that the svg (defined in src/header/icon.ts) defines the styling, which is called header-banner__icon. I'm not quite sure how to do this in jss.
Meaning: I have defined this style in my styleMap.ts. How might I link this style to an svg? Or do I need to just hardcode this style in the svg itself?