add a named font

[todo]

nypr-design-system/app/styles/themes/wqxr/overrides/vars/_fonts.scss

Lines 1 to 6 in b0c31db

 $font-heading: "Playfair Display"; //todo: add a named font 
 $font-body: "OpenSans-Regular", sans-serif; //todo: add a named font 
 $font-body-bold: "OpenSans-Bold", sans-serif; 
  
 $font-cool-heading: 'Monoton', cursive; 
 $font-pixel-heading: 'Press Start 2P', monospace; 

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This issue was generated by todo based on a todo comment in b0c31db when #117 was merged. cc @nypublicradio.