Show player rating on detail page

Also:
* move scripts (except Google Analytics because that's scary stuff) to `<head>` tag

The rating is calculated manually as `mu - 3*sigma` in the angular template because the API server returns the object `{mu: mu, sigma: sigma}` and I was too lazy to make it return something else.
I think having the region here is a little redundant since it's already in the nav bar.