Make fonts on the blog match changes in the web app

[joshsmith]

We changed the fonts in the web app to remove the FOUT and clean things up. We should do the same over here.

[riskiii]

Should I use https://github.com/code-corps/code-corps-ember/blob/develop/app/styles/_fonts.scss as the base for it?

[joshsmith]

@riskiii yes, sorry for delay here! We need to bring the fonts in line with that.

[joshsmith]

And let me know if there are any places that aren't clearly covered by that.