<noscript> skin viewer fallback

[evan-goode]

On the profile page, fall back to displaying a CSS-only skin view when JS is unavailable.

Could do the render serverside, which has the advantage of the skin preview being a proper image instead of a hacked-together mess of CSS. But it is more fun and cheaper on the server to use a big ball of CSS.

Could use https://github.com/rkkoszewski/minecraft-css-3d-skin-viewer/tree/master.