JANRAIN-845 Updates navbar styles

Updates navbar to be teal. Includes deeper red danger colors
I'm not sure. light-sky was left over from a set of metaphors I was playing with while naming quilt colors: sky = background, rivers = navigation, slate = structure, etc.  I'm not using those naming conventions anymore, since they didn't fit the new brand colors the same way they did the old ones.

That hex code doesn't match anything I can find defined anywhere. Where did you pick that from? I have a slightly darker background color: #F4EFE6 for page background and a slightly lighter one: #F6F5F2, for highlight areas.