update bootswatch list

Author: evanwill

_data/theme.yml

@@ -104,7 +104,7 @@ navbar-background: bg-black
 
 # BOOTSWATCH THEMES [optional!]
 # You can replace the standard Bootstrap theme with a Bootswatch (https://github.com/thomaspark/bootswatch) option
-# Choose from: cerulean; cosmo; cyborg; darkly; flatly; journal; litera; lumen; lux; materia; minty; pulse; sandstone; simplex; sketchy; slate; solar; spacelab; superhero; united; yeti 
+# Choose from: brite; cerulean; cosmo; cyborg; darkly; flatly; journal; litera; lumen; lux; materia; minty; morph; pulse; quartz; sandstone; simplex; sketchy; slate; solar; spacelab; superhero; united; vapor; yeti; zephyr 
 bootswatch: # leave blank or comment out for plain bootstrap
 
 # THEME FONTS [optional!]