Use https for font import

[dohliam]

The @import url here should be changed to use https instead of http, because it currently causes a mixed content error that blocks importing the font on secure sites.

[jrwarwick]

I also found some minor differences in the URLs. The "route" or whatever the first part of the URL path is, is now "css2" according to the @import code that the google fonts interface suggests. There might also be something different about the weight parameters.