Import extra Google Fonts

Based off recommendations from here:

https://medium.com/@erikdkennedy/7-rules-for-creating-gorgeous-ui-part-2-430de537ba96

And here:

http://hellohappy.org/beautiful-web-type/
Use a red emphasis color
css: Use nested Less CSS rules

See: http://lesscss.org/features/#features-overview-feature-nested-rules
css: Define variables for CSS highlighting
Set language for syntax highlighting in post
css: Rename color-emphasis-'darkest' to 'dark'
css: Whitespace and color adjustments to navbar
Simplify the HTML and CSS of header and footer